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Berggren, Karolina
Publications (10 of 12) Show all publications
Berggren, K., Packman, J., Ashley, R. & Viklander, M. (2014). Climate changed rainfalls for urban drainage capacity assessment (ed.). Paper presented at . Urban Water Journal, 11(7), 543-556
Open this publication in new window or tab >>Climate changed rainfalls for urban drainage capacity assessment
2014 (English)In: Urban Water Journal, ISSN 1573-062X, Vol. 11, no 7, p. 543-556Article in journal (Refereed) Published
Abstract [en]

Guidance on what type of rainfall to use when assessing hydraulic capacity of urban drainage systems under climate change is unclear; focus is mainly on what climate factors to use. Based on a case study in Kalmar, Sweden, this paper compares system performance using two design rainfalls, Block rainfalls and Chicago Design Storm (CDS), and selected observed rainfalls, with two methods of addressing future climate: a constant factor and Delta Change (DC) factors that depend on rainfall intensity. The use of CDS rainfalls presents the maximum hydraulic response, whereas Block rainfalls give lower responses but identify critical durations in the system, which may be useful addressing adaptation actions. Observed rainfalls of target return periods gave similar responses to CDS rainfalls, and can be applied with DC factors to address future changes in both intensity and volume. Differences between the two methods indicate a high dependence related to the maximum factors applied on the rainfalls

National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-13882 (URN)10.1080/1573062X.2013.851709 (DOI)000338103000003 ()2-s2.0-84903443213 (Scopus ID)d30e30c3-3e06-4b12-92aa-78f1e5ba4c04 (Local ID)d30e30c3-3e06-4b12-92aa-78f1e5ba4c04 (Archive number)d30e30c3-3e06-4b12-92aa-78f1e5ba4c04 (OAI)
Note
Validerad; 2014; 20131128 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Berggren, K. (2014). Urban stormwater systems in future climates: assessment and management of hydraulic overloading (ed.). (Doctoral dissertation). Paper presented at . Luleå tekniska universitet
Open this publication in new window or tab >>Urban stormwater systems in future climates: assessment and management of hydraulic overloading
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increasing global temperatures and tendencies of more frequent extreme weather events have been observed over the recent decades, and the continuation of this trend is predicted by future climate models. Such climatic changes impact on many human activities and hence the interest in, and focus on, climate change has increased rapidly in recent years. One of the fields strongly affected by ongoing climate change is urban water management and, in particular, the provision of urban drainage services. Modern urban drainage systems (UDSs) are designed to manage stormwater and convey residual runoff from urban areas to receiving waters, in order to fulfill such UDS primary functions as e.g., preserving local water balance; mitigating increases in runoff and the associated flood risks; and protecting water quality. There are also other drivers that influence the future urban runoff regime and the UDS performance, including urban planning, land-use changes (progressing urbanization), and implementation of sustainable stormwater management systems by such approaches as e.g., Best management practices (BMPs), Low impact development (LID), Water sensitive urban design (WSUD), and Green Infrastructure (GI). This doctoral thesis focuses on urban rainfall and runoff processes, and runoff conveyance by separate storm sewer systems, and the changes in these processes caused by climate change, with the overall objective of investigating urban stormwater systems response and performance related to future climate changes, and particularly the future rainfall regime, by means of urban rainfall/runoff modelling. Furthermore, future influences on the runoff regime of urban green/pervious areas have also been studied. Specifically, the thesis has focused on future rainfall changes and hydraulic performance of the stormwater system, and the influential response parameters needed for evaluating the simulated impacts, with the overall aim of contributing new knowledge to this field. The results included in the thesis are based on three published journal papers, one manuscript, and three conference papers. The research project started by addressing the needs for relevant UDS hydraulic response parameters (or indicators), which reflect both the capacity exceedance (when the UDS design fails) and indicate the safety margins in the system (e.g., locations with low or high capacities). The pipe flow rate and maximum water levels in the system exceeding a critical level, are examples of such parameters. Another issue addressed in this thesis is the difference in resolution (temporal and spatial) of the original climate model data (even if downscaled) compared to the requirements on rainfall input data in urban drainage modelling. Therefore, an existing statistical downscaling method (the delta change method, DCM) was refined by focusing on changes in rainfall intensities and seasonal rainfalls, and the refined DCM was recommended for use in UDS modelling. The UDS performance in future climates, studied by modelling these systems, showed that a future change in rainfall poses significant impacts on the existing UDSs. Important aspects in addressing such impacts are, for example, the input rainfall data types (e.g. design storms, or observed rainfall), as well as the climate factors, and the methods used to produce such factors. Green/permeable areas within the urban catchments may, however, provide opportunities for adaptation of urban catchments and UDS, by potentially increasing the infiltration of rainwater, instead of converting it into rapid runoff contributing high flows and flow volumes to the urban drainage systems. Influential factors in these processes include soil types, soil moisture content, groundwater levels and the rainfall input. While climate change with uplifted rainfalls tends to increase runoff contributions from all urban surfaces (impervious and green/pervious), strategic application of runoff controls in the form green infrastructure may counterbalance such increases, and even lead to reduced runoff inflows into the UDS.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2014
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-18373 (URN)8471ddf3-a44c-4a4c-a855-8ffa1cfa7e8f (Local ID)978-91-7439-929-5 (ISBN)978-91-7439-930-1 (ISBN)8471ddf3-a44c-4a4c-a855-8ffa1cfa7e8f (Archive number)8471ddf3-a44c-4a4c-a855-8ffa1cfa7e8f (OAI)
Note

Godkänd; 2014; 20140416 (karober); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Karolina Berggren Ämne: VA-teknik/Sanitary Engineering Avhandling: Urban Stormwater Systems in Future Climates Assessment and Management of Hydraulic Overloading Opponent: Professor emeritus Adrian Saul, Department of Civil and Structural Engineering, University of Sheffield, Storbritannien, Ordförande: Professor Maria Viklander, Avd för arkitektur och vatten, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Torsdag den 12 juni 2014, kl 10.00 Plats: D770, Luleå tekniska universitet

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Berggren, K., Moghadas, S., Gustafsson, A.-M., Ashley, R. & Viklander, M. (2013). Sensitivity of urban stormwater systems to runoff from green/pervious areas in a changing climate (ed.). Paper presented at Novatech 2013 : International Conference on Planning and Technologies for Sustainable Urban Water Management 23/06/2013 - 26/06/2013. Paper presented at Novatech 2013 : International Conference on Planning and Technologies for Sustainable Urban Water Management 23/06/2013 - 26/06/2013.
Open this publication in new window or tab >>Sensitivity of urban stormwater systems to runoff from green/pervious areas in a changing climate
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2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-36923 (URN)abf2bf6f-d38c-4117-9b74-d0389d0bc4fa (Local ID)abf2bf6f-d38c-4117-9b74-d0389d0bc4fa (Archive number)abf2bf6f-d38c-4117-9b74-d0389d0bc4fa (OAI)
Conference
Novatech 2013 : International Conference on Planning and Technologies for Sustainable Urban Water Management 23/06/2013 - 26/06/2013
Note
Godkänd; 2013; 20131128 (karober)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Berggren, K., Lans, A., Viklander, M. & Ashley, R. (2012). Future changes affecting hydraulic capacity of urban storm water systems (ed.). In: (Ed.), (Ed.), Urban Drainage Modelling: Proceedings of the Ninth International Conference on Urban Drainage Modeling, Belgrade, Serbia, 4-6 September 2012. Paper presented at International Conference on Urban Drainage Modelling : 04/09/2012 - 06/09/2012. Belgrade: Faculty of Civil Engineering, University of Belgrade
Open this publication in new window or tab >>Future changes affecting hydraulic capacity of urban storm water systems
2012 (Swedish)In: Urban Drainage Modelling: Proceedings of the Ninth International Conference on Urban Drainage Modeling, Belgrade, Serbia, 4-6 September 2012, Belgrade: Faculty of Civil Engineering, University of Belgrade , 2012Conference paper, Published paper (Refereed)
Abstract [en]

Urban areas may develop and change its character over time, but the urban drainage system is often 12 more constant in character – as the technical design life can be up to 100 years. The hydraulic capacity 13 of an existing urban storm water system is affected by future changes, e.g. rate of imperviousness 14 (urbanization), changes in the rainfall characteristics (e.g. by climate change) and system deterioration 15 (pipes and other facilities). Recently the urban planning process in Sweden and elsewhere has become 16 more appreciative of urban drainage issues, and the need to include these earlier in development 17 processes. In this paper a small urban catchment is used to study how future factors affect the 18 hydraulic capacity and the potential development of the area. Factors tested are scenarios of: (1) 19 Urbanization; (2) Climate change and (3) Pipe system deterioration. The results show that each of 20 these factors impact on the hydraulic capacity and that any sensitivity analysis should include all of 21 them to understand future development potential for the area. This type of investigation can increase 22 the understanding of the needs of the infrastructure provision in the area in a planning process context, 23 and provide information about appropriate areas of development within the catchment.

Place, publisher, year, edition, pages
Belgrade: Faculty of Civil Engineering, University of Belgrade, 2012
Keywords
Civil engineering and architecture - Water engineering, climate change, drainage, modeling, pipe deterioration, planning process, storm water, Samhällsbyggnadsteknik och arkitektur - Vattenteknik
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-38322 (URN)cac0bb1d-af34-49f0-8567-4606242033a0 (Local ID)978-86-7518-156-9 (ISBN)cac0bb1d-af34-49f0-8567-4606242033a0 (Archive number)cac0bb1d-af34-49f0-8567-4606242033a0 (OAI)
Conference
International Conference on Urban Drainage Modelling : 04/09/2012 - 06/09/2012
Note
Godkänd; 2012; 20130226 (karober)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Berggren, K., Olofsson, M., Viklander, M., Svensson, G. & Gustafsson, A.-M. (2012). Hydraulic impacts on urban drainage systems due to changes in rainfall, caused by climatic change (ed.). Paper presented at . Journal of hydrologic engineering, 17(1), 92-98
Open this publication in new window or tab >>Hydraulic impacts on urban drainage systems due to changes in rainfall, caused by climatic change
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2012 (English)In: Journal of hydrologic engineering, ISSN 1084-0699, E-ISSN 1943-5584, Vol. 17, no 1, p. 92-98Article in journal (Refereed) Published
Abstract [en]

The changes in climate were of a growing concern in the last decade, and will be even more so in the coming years. When investigating impacts on urban drainage systems due to changes in the climate, two challenges are (1) what type of input rainfall data to use, and (2) what parameters to measure the impacts. The overall objective of this study is to investigate the hydraulic performances ofurban drainage systems related to changes in rainfall, and through these hydraulic parameters describe impacts of climate change. Input rainfall data represents today's climate, as well as three future time periods (2011-2040, 2041-2070, and 2071-2100). The hydraulic parameters used were water levels in nodes (e.g. as the number of floods, frequency and duration of floods), and pipe flow ratio. For the study area, the number of flooded nodes and the geographical distribution of floods will increase in the future, as will both the flooding frequency and the duration of floods.

National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-14578 (URN)10.1061/(ASCE)HE.1943-5584.0000406 (DOI)000300438500010 ()2-s2.0-84857228025 (Scopus ID)df8d3c02-14a0-4ff4-8554-b1e9d3fda3b0 (Local ID)df8d3c02-14a0-4ff4-8554-b1e9d3fda3b0 (Archive number)df8d3c02-14a0-4ff4-8554-b1e9d3fda3b0 (OAI)
Note
Validerad; 2012; 20111110 (karober)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Moghadas, S., Berggren, K., Gustafsson, A.-M. & Viklander, M. (2011). Regional and seasonal variation in future climate: is green roof one solution? (ed.). Paper presented at International Conference on Urban Drainage : 11/09/2011 - 15/09/2011. Paper presented at International Conference on Urban Drainage : 11/09/2011 - 15/09/2011.
Open this publication in new window or tab >>Regional and seasonal variation in future climate: is green roof one solution?
2011 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In this study, regional climate data was used to investigate the trend of changes for some climatic parameters, i.e. temperature, precipitation and maximum hourly precipitation in four different regions in Sweden. The general trend shows that Sweden will have warmer and wetter climatic conditions by 2100; however, the seasonal changes will affect the system differently, which makes them one of the main factors to be considered. The climatic data was used to determine the probable magnitude of changes by 2100 and to investigate the climate change impacts on urban drainage systems. The problems arising due to such changes were discussed regionally and seasonally and finally BMP methods, as an alternative way, to mitigate the climate change impacts were considered. As an example, green roof was applied to different urbanized conditions to estimate the approximate reduction of the extra water into the drainage system. As well as to investigate how much each of the BMP methods (green roof as an example for opening the further studies) could be useful for city planners towards more secure and sustainable cities in the future against the climate change.

National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-31612 (URN)5da9346a-3109-401e-a182-880cd4483919 (Local ID)5da9346a-3109-401e-a182-880cd4483919 (Archive number)5da9346a-3109-401e-a182-880cd4483919 (OAI)
Conference
International Conference on Urban Drainage : 11/09/2011 - 15/09/2011
Note
Godkänd; 2011; 20120510 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Olsson, J., Berggren, K., Olofsson, M. & Viklander, M. (2009). Applying climate model precipitation scenarios for urban hydrological assessment: a case study in Kalmar City, Sweden (ed.). Paper presented at . Atmospheric research, 62(3), 364-375
Open this publication in new window or tab >>Applying climate model precipitation scenarios for urban hydrological assessment: a case study in Kalmar City, Sweden
2009 (English)In: Atmospheric research, ISSN 0169-8095, E-ISSN 1873-2895, Vol. 62, no 3, p. 364-375Article in journal (Refereed) Published
Abstract [en]

There is growing interest in the impact of climate change on urban hydrological processes. Such assessment may be based on the precipitation output from climate models. To date, the model resolution in both time and space has been too low for proper assessment, but at least in time the resolution of available model output is approaching urban scales. In this paper, 30-min precipitation from a model grid box covering Kalmar City, Sweden, is compared with high-resolution (tipping-bucket) observations from a gauge in Kalmar. The model is found to overestimate the frequency of low rainfall intensities, and therefore the total volume, but reasonably well reproduce the highest intensities. Adapting climate model data to urban drainage applications can be done in several ways but a popular way is the so-called Delta Change (DC) method. In this method, relative changes in rainfall characteristics estimated from climate model output are transferred to an observed rainfall time series, generally by multiplicative factors. In this paper, a version of the method is proposed in which these DC factors (DCFs) are related to the rainfall intensity level. This is achieved by calculating changes in the probability distribution of rainfall intensities and modelling the DCFs as a function of percentile. Applying this method in Kalmar indicated that in summer and autumn, high intensities will increase by 20-60% by year 2100, whereas low intensities remain stable or decrease. In winter and spring, generally all intensity levels increase similarly. The results were transferred to the observed time series by varying the volume of the tipping bucket to reflect the estimated intensity changes on a 30-min time scale. In an evaluation of the transformed data at a higher 5-min resolution, effects on the intensity distribution as well as single precipitation events were demonstrated. In particular, qualitatively different changes in peak intensity and total volume are attainable, which is required in light of expected future changes of the precipitation process and a step forward as compared with simpler DC approaches. Using the DC transformed data as input in urban drainage simulations for a catchment in Kalmar indicated an increase of the number of surface floods by 20-45% during this century.

National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-4203 (URN)10.1016/j.atmosres.2009.01.015 (DOI)000265464600009 ()2-s2.0-62849089882 (Scopus ID)21db5fc0-08c8-11de-9f31-000ea68e967b (Local ID)21db5fc0-08c8-11de-9f31-000ea68e967b (Archive number)21db5fc0-08c8-11de-9f31-000ea68e967b (OAI)
Note
Validerad; 2009; 20090304 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Berggren, K. (2008). Indicators for urban drainage system: assessment of climate change impacts (ed.). In: (Ed.), (Ed.), Conference Proceedings : 11th International Conference on Urban Drainage: Edinburgh International Conference Centre, Scotland : 11 ICUD: 31st August - 5th September 2008. Paper presented at International Conference on Urban Drainage : 31/08/2008 - 05/09/2008. Munich: Oldenbourg Industrieverlag
Open this publication in new window or tab >>Indicators for urban drainage system: assessment of climate change impacts
2008 (English)In: Conference Proceedings : 11th International Conference on Urban Drainage: Edinburgh International Conference Centre, Scotland : 11 ICUD: 31st August - 5th September 2008, Munich: Oldenbourg Industrieverlag , 2008Conference paper, Published paper (Refereed)
Abstract [en]

Changes of the climatic conditions will affect urban drainage systems, as they are closely related to the weather phenomenon and are built as to cope with the weather occurring. The aim of this paper is to investigate indicators that can be used to describe and compare impacts and adaptation measures in existing urban drainage systems. Problems in the system due to climate change can be summarised as problems with flooding of surfaces and basements, increased amount of combined sewer overflows (CSO), increase of the inflow to waste water treatment plants (WWTP) and increase in pollutants spreading from urban areas to the environment. The impacts needs to be described with indicators taking into account the system behaviour both before, during and after an event (e.g. urban flooding) has occurred, and can be divided into (A) description of the system performance, (B) capacity exceeding in the system, and (C) description of consequences as a result of capacity exceeding. The consequences can be divided into sustainable aspects as: technical, economical, socio-cultural, environmental, and health. The research is performed within a project which will also include model simulations of urban drainage systems in four Swedish municipalities as to assess impacts and evaluate the use of indicators.

Place, publisher, year, edition, pages
Munich: Oldenbourg Industrieverlag, 2008
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-30617 (URN)47a75180-7e64-11dd-935c-000ea68e967b (Local ID)47a75180-7e64-11dd-935c-000ea68e967b (Archive number)47a75180-7e64-11dd-935c-000ea68e967b (OAI)
Conference
International Conference on Urban Drainage : 31/08/2008 - 05/09/2008
Note
Godkänd; 2008; 20080909 (karober)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Berggren, K., Olofsson, M., Viklander, M. & Svensson, G. (2007). Tools for measuring climate change impacts on urban drainage systems (ed.). In: (Ed.), (Ed.), Techniques et stratégies durables pour la gestion des eaux urbaines par temps de pluie: NOVATECH 2007 ; 6e conférence internationale, juin 2007, Lyon, France. Paper presented at NOVATECH 2007 : 24/06/2007 - 29/06/2007 (pp. 239-246). Villeurbanne: Graie, 1
Open this publication in new window or tab >>Tools for measuring climate change impacts on urban drainage systems
2007 (English)In: Techniques et stratégies durables pour la gestion des eaux urbaines par temps de pluie: NOVATECH 2007 ; 6e conférence internationale, juin 2007, Lyon, France, Villeurbanne: Graie , 2007, Vol. 1, p. 239-246Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Villeurbanne: Graie, 2007
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-37804 (URN)bee9c6b0-6a97-11dc-9e58-000ea68e967b (Local ID)2-9509337-7-7 (ISBN)bee9c6b0-6a97-11dc-9e58-000ea68e967b (Archive number)bee9c6b0-6a97-11dc-9e58-000ea68e967b (OAI)
Conference
NOVATECH 2007 : 24/06/2007 - 29/06/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Les outils de mesure des effets du changement climatique sur les systèmes d'assainissement pluvial urbain; 20070924 (karober)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Berggren, K. (2007). Urban drainage and climate change: impact assessment (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Urban drainage and climate change: impact assessment
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

According to the Intergovernmental Panel on Climate Change (IPCC, 2007), the global mean temperature has increased by 0,7 °C during the last 100 years and, as a consequence, the hydrological cycle has intensified with, for example, more intense rainfall events. As urban drainage systems have been developed over a long period of time and design criteria are based upon climatic characteristics, these changes will affect the systems and the city accordingly.The overall objective of this thesis is to increase the knowledge about urban drainage in a changing climate. In more detail, the objective is to investigate how climate change may affect urban drainage systems, and also to suggest methods for these investigations.The thesis consists of four papers. The first paper concentrates on the Delta change method for adaptation of rainfall data from climate models for urban hydrology use. The second paper is an impact assessment with urban drainage model simulation of a study area in the south of Sweden. The third paper is also an impact study, from a cause and effect approach, where the whole urban water is included. Finally, the fourth paper contains a strategy and suggestions about tools to use for assessing impacts on urban drainage systems due to climate change. The suggested tools are urban drainage model simulations, Geographical Information Systems (GIS), and risk analysis methods.The Delta change approach is feasible for handling the differences in spatial and temporal resolution between climate model data and the needs for urban drainage model simulations, as the method is relatively simple and the temporal resolution of observed rainfall series is preserved. In the study area with separated storm water system, the model simulations show that the number of surface floods as well as the geographical distribution of the floods increases in the future time periods (2011-2040, 2041-2070, and 2071-2100). Future precipitation will also increase both the flooding frequency and the duration of floods; therefore, the need to handle future situations in urban drainage systems and to have a well-planned strategy to cope with future conditions is evident. The overall impacts on urban drainage systems due to increased precipitation may, for example, be an increased number of basement floods, surface floods, problems with property and road drainage, and also increased amount of infiltration into pipes and combined sewer overflows (CSOs). The knowledge gained from this thesis, and the strategy suggested, can be used as a starting point for impact studies on urban drainage systems. Since most impacts concern several different disciplines and a multifunctional understanding, the studies should also be performed in cooperation with parties concerned.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2007. p. 43
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2007:40
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-25792 (URN)b24ce840-773c-11dc-80da-000ea68e967b (Local ID)b24ce840-773c-11dc-80da-000ea68e967b (Archive number)b24ce840-773c-11dc-80da-000ea68e967b (OAI)
Note
Godkänd; 2007; 20071010 (karober)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved
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