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Publications (10 of 20) Show all publications
Amer, E., Gren, P., Ramser, K. & Sjödahl, M. (2018). Measurement of selective species concentration using spectroscopic holography. In: M. Kujawińska ; L. R. Jaroszewicz (Ed.), Speckle 2018: VII International Conference on Speckle Metrology. Paper presented at Speckle 2018: VII International Conference On Speckle Metrology 9-12 September 2018 Janów Podlaski, Poland. SPIE - International Society for Optical Engineering, 10834, Article ID 108340P.
Open this publication in new window or tab >>Measurement of selective species concentration using spectroscopic holography
2018 (English)In: Speckle 2018: VII International Conference on Speckle Metrology / [ed] M. Kujawińska ; L. R. Jaroszewicz, SPIE - International Society for Optical Engineering, 2018, Vol. 10834, article id 108340PConference paper, Published paper (Refereed)
Abstract [en]

Spectroscopic holography refers to techniques in which the detected hologram contains information about specific species in the medium under study. In general, at least two lasers are required with wavelengths chosen carefully to fit the interaction process utilized. In this process, energy from the shorter wavelength laser beam is transferred to the longer wavelength coherently through the process of stimulated emission. Two interaction mechanisms are considered; Stimulated Laser Induced Fluorescence (LIF) and Stimulated Raman Scattering (SRS), which both are species specific with the ability of coherent interaction. In this paper, the fundamental properties of spectroscopic holography is presented and demonstrated with a few idealized experiments. These validation experiments are performed in a gas chamber in which different gases may be blended and the gas pressure changed between 1-12 bars. In addition, two examples of applications are presented. In the first set of experiments, LIF holography is used to image light absorption and laser heating in a dye simultaneously. The second set of experiments is performed in a ow of methane gas. It is demonstrated that the combination of holographic phase measurements and SRS gain images may be used for calibration. This calibration may further be used to measure absolute concentration in a burning flame.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2018
Series
Proceedings of SPIE - the International Society for Optical Engineering, ISSN 0277-786X ; 10834
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-72430 (URN)10.1117/12.2319386 (DOI)000455052600021 ()2-s2.0-85058412906 (Scopus ID)9781510622975 (ISBN)
Conference
Speckle 2018: VII International Conference On Speckle Metrology 9-12 September 2018 Janów Podlaski, Poland
Available from: 2019-01-03 Created: 2019-01-03 Last updated: 2019-01-28Bibliographically approved
Sjödahl, M. & Amer, E. (2018). Quantitative measurement of thin phase objects: comparison of speckle deflectometry and defocus-variant lateral shear interferometry. Applied Optics, 57(14), 3645-3652
Open this publication in new window or tab >>Quantitative measurement of thin phase objects: comparison of speckle deflectometry and defocus-variant lateral shear interferometry
2018 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 57, no 14, p. 3645-3652Article in journal (Refereed) Published
Abstract [en]

The two techniques of lateral shear interferometry and speckle deflectometry are analyzed in a common optical system for their ability to measure phase gradient fields of a thin phase object. The optical system is designed to introduce a shear in the frequency domain of a telecentric imaging system that gives a sensitivity of both techniques in proportion to the defocus introduced. In this implementation, both techniques successfully measure the horizontal component of the phase gradient field. The response of both techniques scales linearly with the defocus distance, and the precision is comparative, with a random error in the order of a few rad/mm. It is further concluded that the precision of the two techniques relates to the transverse speckle size in opposite ways. While a large spatial coherence width, and correspondingly a large lateral speckle size, makes lateral shear interferometry less susceptible to defocus, a large lateral speckle size is detrimental for speckle correlation. The susceptibility for the magnitude of the defocus is larger for the lateral shear interferometry technique as compared to the speckle deflectometry technique. The two techniques provide the same type of information; however, there are a few fundamental differences. Lateral shear interferometry relies on a special hardware configuration in which the shear angle is intrinsically integrated into the system. The design of a system sensitive to both in-plane phase gradient components requires a more complex configuration and is not considered in this paper. Speckle deflectometry, on the other hand, requires no special hardware, and both components of the phase gradient field are given directly from the measured speckle deformation field.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-68878 (URN)10.1364/AO.57.003645 (DOI)000431880000003 ()2-s2.0-85046971352 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-05-24 (andbra)

Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-08-21Bibliographically approved
Amer, E., Gren, P., Edenharder, S. & Sjödahl, M. (2016). Stimulated Raman scattering detection for chemically specific time-resolved imaging of gases (ed.). Paper presented at . Optics Express, 24(9), 9984-9993
Open this publication in new window or tab >>Stimulated Raman scattering detection for chemically specific time-resolved imaging of gases
2016 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 24, no 9, p. 9984-9993Article in journal (Refereed) Published
Abstract [en]

stimulated Raman scattering (SRS) imaging technique based on spatial modulation of the pump beam has been used to study gases. The SRS gain signal was separated from the Stokes beam background in the spatial frequency domain. The SRS signal shows linear behaviour with the gas pressure at a range from 1.0 to 8.0 bars. The signal is linearly proportional to the pump beam intensity while it is enhanced with increasing the Stokes beam intensity to a certain limit than it saturates. Further, the chemical specificity of the technique has been investigated. Two sharp peaks with line width at half maximum of about 0.30 nm have been obtained at Stokes beam wavelengths of 629.93 nm and 634.05 nm corresponding to the methane and ethylene gases, respectively. The results show that SRS imaging is a promising technique to provide chemical specificity as well as spatial and temporal information of gaseous species

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-12946 (URN)10.1364/OE.24.009984 (DOI)000375259600080 ()2-s2.0-84973345214 (Scopus ID)c197e0a8-1b93-48a3-84b6-7d1f57b1ce72 (Local ID)c197e0a8-1b93-48a3-84b6-7d1f57b1ce72 (Archive number)c197e0a8-1b93-48a3-84b6-7d1f57b1ce72 (OAI)
Note
Validerad; 2016; Nivå 2; 20160527 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amer, E., Gren, P., Edenharder, S. & Sjödahl, M. (2016). Stimulated Raman scattering holography for time-resolved imaging of methane gas (ed.). Paper presented at . Applied Optics, 55(13), 3429-3434
Open this publication in new window or tab >>Stimulated Raman scattering holography for time-resolved imaging of methane gas
2016 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, no 13, p. 3429-3434Article in journal (Refereed) Published
Abstract [en]

In this paper, pulsed digital holographic detection is coupled to the stimulated Raman scattering (SRS) process for imaging gases. A Q-switched Nd-YAG laser (532 nm) has been used to pump methane gas (CH4) at pressures up to 12 bars. The frequency-tripled (355 nm) beam from the same laser was used to pump an optical parametric oscillator (OPO). The Stokes beam (from the OPO) has been tuned to 629.93 nm so that the frequency difference between the pump (532 nm) and the Stokes beams fits a Raman active vibrational mode of the methane molecule (2922 cm(-1)). The pump beam has been spatially modulated with fringes produced in a Michelson interferometer. The pump and the Stokes beams were overlapped in time, space, and polarization on the gas molecules, resulting in a stimulated Raman gain of the Stokes beam and a corresponding loss of the pump beam through the SRS process. The resulting gain of the Stokes beam has been detected using pulsed digital holography by blending it with a reference beam on the detector. Two holograms of the Stokes beam, without and with the pump beam fringes present, were recorded. Intensity maps calculated from the recorded digital holograms showed amplification of the Stokes beam at the position of overlap with the pump beam fringes and the gas molecules. The gain of the Stokes beam has been separated from the background in the Fourier domain. A gain of about 4.5% at a pump beam average intensity of 4 MW/cm(2) and a Stokes beam intensity of 0.16 MW/cm(2) have been recorded at a gas pressure of 12 bars. The gain decreased linearly with decreasing gas pressure. The results show that SRS holography is a promising technique to pinpoint a specific species and record its spatial and temporal distribution

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-7525 (URN)10.1364/AO.55.003429 (DOI)000375154900008 ()2-s2.0-84969914697 (Scopus ID)5ea329fd-fab9-45f7-abf3-b8783c3bcc06 (Local ID)5ea329fd-fab9-45f7-abf3-b8783c3bcc06 (Archive number)5ea329fd-fab9-45f7-abf3-b8783c3bcc06 (OAI)
Note
Validerad; 2016; Nivå 2; 20160527 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Field, J., Amer, E., Gren, P., Zafar, M. & Walley, S. M. (2015). High-speed photographic study of laser damage and ablation (ed.). Paper presented at . Imaging Science Journal, 63(3), 119-136
Open this publication in new window or tab >>High-speed photographic study of laser damage and ablation
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2015 (English)In: Imaging Science Journal, ISSN 1368-2199, E-ISSN 1743-131X, Vol. 63, no 3, p. 119-136Article in journal (Refereed) Published
Abstract [en]

This paper reviews earlier work and describes a photographic investigation of damage produced in glasses, polymers and crystals by Q-switched and non-Q-switched laser pulses. The cameras used in the study include a Wollensak Fastax WF3 camera, a Beckman & Whitley (model 189) rotating mirror camera, and a Beckman & Whitley (model 501) image converter camera. The formation of internal disc-type cracks with the non-Q-switched pulse was studied in detail. The use of these cracks for fracture energy studies is demonstrated. Photographic sequences show the production of micro-plasmas associated with damage, and stress waves formed during irradiation in both solids and liquids. A recent development is that of digital holography which adds phase and intensity information to the more conventional photographic techniques. This technique is used here to study laser ablation and wave propagation in water. The photographic data shows the processes taking place in the laser interaction with a wide range of materials and should be of interest to modellers.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-2409 (URN)10.1179/1743131X14Y.0000000100 (DOI)000349354100001 ()2-s2.0-84922474788 (Scopus ID)007e4578-c680-497d-a3f5-b0efd75ebbeb (Local ID)007e4578-c680-497d-a3f5-b0efd75ebbeb (Archive number)007e4578-c680-497d-a3f5-b0efd75ebbeb (OAI)
Note
Validerad; 2015; Nivå 2; 20150220 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Khodadad, D., Amer, E., Gren, P., Melander, E., Hällstig, E. & Sjödahl, M. (2015). Single-shot dual-polarization holography: measurement of the polarization state of a magnetic sample (ed.). In: (Ed.), Fernando Mendoza Santoyo; Eugenio R. Mendez (Ed.), SPECKLE 2015: VI International Conference on Speckle Metrology. : SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Single-shot dual-polarization holography: measurement of the polarization state of a magnetic sample
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2015 (English)In: SPECKLE 2015: VI International Conference on Speckle Metrology / [ed] Fernando Mendoza Santoyo; Eugenio R. Mendez, SPIE - International Society for Optical Engineering, 2015Conference paper, Published paper (Refereed)
Abstract [en]

In this paper a single-shot digital holographic set-up with two orthogonally polarized reference beams is proposed to achieve rapid acquisition of Magneto-Optical Kerr Effect images. Principles of the method and the background theory for dynamic state of polarization measurement by use of digital holography are presented. This system has no mechanically moving elements or active elements for polarization control and modulation. An object beam is combined with two reference beams at different off-axis angles and is guided to a detector. Then two complex fields (interference terms) representing two orthogonal polarizations are recorded in a single frame simultaneously. Thereafter the complex fields are numerically reconstructed and carrier frequency calibration is done to remove aberrations introduced in multiplexed digital holographic recordings. From the numerical values of amplitude and phase, a real time quantitative analysis of the polarization state is possible by use of Jones vectors. The technique is demonstrated on a magnetic sample that is a lithographically patterned magnetic microstructure consisting of thin permalloy parallel stripes

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2015
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 9660
Keywords
Single-shot acquisition, holography, dual-polarization, Magneto-Optical Kerr Effect, polarization, measurement, multiplexed holography, Technology - Electrical engineering, electronics and photonics, Teknikvetenskap - Elektroteknik, elektronik och fotonik
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-34046 (URN)10.1117/12.2189782 (DOI)000360300500036 ()2-s2.0-84943551779 (Scopus ID)82680dae-42a6-4c75-92d6-621694a624d6 (Local ID)9781628418781 (ISBN)82680dae-42a6-4c75-92d6-621694a624d6 (Archive number)82680dae-42a6-4c75-92d6-621694a624d6 (OAI)
Note
Validerad; 2015; Nivå 1; 20150829 (davkho)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Amer, E., Gren, P. & Sjödahl, M. (2015). Stimulated Raman scattering imaging for studying specific species (ed.). In: (Ed.), Fernando Mendoza Santoyo (Ed.), SPECKLE 2015: VI International Conference on Speckle Metrology : 24-26 August 2015, Guanajuato, México. Paper presented at International Conference on Speckle Metrology : 24/08/2015 - 26/08/2015. Washington: SPIE - International Society for Optical Engineering, Article ID 96600V.
Open this publication in new window or tab >>Stimulated Raman scattering imaging for studying specific species
2015 (English)In: SPECKLE 2015: VI International Conference on Speckle Metrology : 24-26 August 2015, Guanajuato, México / [ed] Fernando Mendoza Santoyo, Washington: SPIE - International Society for Optical Engineering, 2015, article id 96600VConference paper, Published paper (Refereed)
Abstract [en]

The stimulated Raman scattering (SRS) signal in diffuse light has been recorded using an optical imaging technique based on spatial modulation. A frequency doubled Q-switched Nd-YAG laser (wavelength 532 nm) has been used to pump a polymethyl methacrylate (PMMA) cylinder. The frequency tripled (355 nm) beam from the same laser is used to pump an optical parametric oscillator (OPO). The Stokes beam (from the OPO) has been tuned to 631.27 nm so that the frequency difference between the pump and the Stokes beams fits a Raman active vibrational mode of the PMMA molecule (2956 cm-1). The two laser beams were overlapped in time and space on a PMMA cylinder resulting in a gain of the Stokes beam through the SRS process of about 4.0 %. For separating the SRS signal, the pump beam was spatially modulated with fringes produced in a Michelson interferometer. The gain of the Stokes beam due to SRS was separated from the Stokes beam background in the Fourier domain. The intensity image has been calculated from an inverse Fourier transform of the separated gain signal. The intensity image shows a gain of the Stokes beam at the area of overlap between the pump beam fringes and the Stokes beam compared to the undisturbed surrounding. The results show that spatial modulation of the pump beam is a promising method to separate the weak SRS signal from the Stokes beam background. This technique can be applied to pin-point specific species and record its spatial and temporal distribution

Place, publisher, year, edition, pages
Washington: SPIE - International Society for Optical Engineering, 2015
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 9660
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-35575 (URN)10.1117/12.2189460 (DOI)000360300500020 ()2-s2.0-84943574053 (Scopus ID)a271074a-707f-4c7c-980f-917422a2b560 (Local ID)9781628418781 (ISBN)a271074a-707f-4c7c-980f-917422a2b560 (Archive number)a271074a-707f-4c7c-980f-917422a2b560 (OAI)
Conference
International Conference on Speckle Metrology : 24/08/2015 - 26/08/2015
Note
Validerad; 2015; Nivå 1; 20151019 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Amer, E., Gren, P. & Sjödahl, M. (2015). Stimulated Raman scattering signals recorded by the use of an optical imaging technique (ed.). Paper presented at . Applied Optics, 54(20), 6377-6385
Open this publication in new window or tab >>Stimulated Raman scattering signals recorded by the use of an optical imaging technique
2015 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 54, no 20, p. 6377-6385Article in journal (Refereed) Published
Abstract [en]

In this paper, stimulated Raman scattering (SRS) signals have been recorded by an optical imaging technique that is based on spatial modulation. A frequency doubled Q-switched Nd:YAG laser (532 nm) was used to pump a polymethyl methacrylate (PMMA) target. The frequency tripled (355 nm) beam from the same laser was used to pump an optical parametric oscillator (OPO). The Stokes beam (from the OPO) was tuned to 631.27 nm so that the frequency difference between the pump and the Stokes beams fit the Raman active vibrational mode of the PMMA molecule (2956 cm(-1)). The pump beam has been spatially modulated with fringes produced in a Michelson interferometer. The pump and the Stokes beams were overlapped on the target resulting in a gain of the Stokes beam of roughly 2.5% and a corresponding loss of the pump beam through the SRS process. To demodulate the SRS signal, two images of the Stokes beam without and with the pump beam fringes present were recorded. The difference between these two images was calculated and Fourier transformed. Then, the gain of the Stokes beam was separated from the background in the Fourier domain. The results show that spatial modulation of the pump beam is a promising method to separate the weak SRS signal from the background.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-14801 (URN)10.1364/AO.54.006377 (DOI)000357889200033 ()e38a6d0c-6f01-41dd-8421-dee1137d71e1 (Local ID)e38a6d0c-6f01-41dd-8421-dee1137d71e1 (Archive number)e38a6d0c-6f01-41dd-8421-dee1137d71e1 (OAI)
Note
Validerad; 2015; Nivå 2; 20150814 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amer, E., Gren, P. & Sjödahl, M. (2013). Stimulated laser induced fluorescence holography for imaging fluorescent species (ed.). Paper presented at . Optics Communications, 311, 124-128
Open this publication in new window or tab >>Stimulated laser induced fluorescence holography for imaging fluorescent species
2013 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 311, p. 124-128Article in journal (Refereed) Published
Abstract [en]

In this paper pulsed digital holographic detection is coupled to the stimulated laser induced fluorescence (LIF) effect for imaging fluorescent species. A frequency tripled Q-switched Nd-YAG laser (wavelength 355 nm, pulse duration 12 ns) has been used to pump Coumarin 153 dye solved in ethanol. Simultaneously a frequency doubled pulse (532 nm) from the same laser is used to probe the solvent resulting in a gain through stimulated emission. The resulting gain of the probe beam is recorded using digital holography by blending it with a reference beam on the detector. Intensity maps were calculated from the recorded digital holograms and used to calculate the gain of the probe beam due to stimulated fluorescence emission which is coupled to the concentration of the dye. The results show that the amplification of the probe beam (532 nm) due to stimulated LIF emission is seen in the intensity maps. The gain is about 40% at a dye concentration of 0.32 g/L and decreases to be about 20% at a dye concentration of 0.04 g/L for a probe beam energy density of 0.1 mJ/cm2. Spectroscopic measurements have been carried out to confirm the holographic results. The results show that stimulated LIF holography is a promising technique for quantitative imaging of fluorescent species.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-5681 (URN)10.1016/j.optcom.2013.08.056 (DOI)000330908800021 ()2-s2.0-84884266975 (Scopus ID)3d8b1a3a-c76a-4a7a-a05e-537d78ba0c4a (Local ID)3d8b1a3a-c76a-4a7a-a05e-537d78ba0c4a (Archive number)3d8b1a3a-c76a-4a7a-a05e-537d78ba0c4a (OAI)
Note
Validerad; 2013; 20130902 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amer, E., Stenvall, J., Gren, P. & Sjödahl, M. (2013). Stimulated LIF studied using pulsed digital holography and modelling (ed.). In: (Ed.), Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi (Ed.), Optical Measurement Systems for Industrial Inspection VIII: . Paper presented at Optical Measurement Systems for Industrial Inspection : 13/05/2013 - 13/05/2013. SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Stimulated LIF studied using pulsed digital holography and modelling
2013 (English)In: Optical Measurement Systems for Industrial Inspection VIII / [ed] Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi, SPIE - International Society for Optical Engineering, 2013Conference paper, Published paper (Refereed)
Abstract [en]

A frequency tripled Q-switched Nd-YAG laser (wavelength 355 nm, pulse duration 12 ns) has been used to pump Coumarin 153 dye solved in ethanol. The laser induced fluorescence (LIF) spectrum has been recorded using a spectrometer at different dye concentrations. The frequency doubled 532 nm beam from the same laser is used as a probe beam to pass through the excited volume of the dye. Because of stimulated emission an increase of the probe (532 nm) beam energy is recorded and a reduction of the spontaneous fluorescence spectrum intensity is observed. A model was developed that approaches the trend of the gain as a function of the probe beam energy at low dye concentrations (less than 0.08 g/L). The stimulated LIF is further recorded using digital holography. Digital holograms were recorded for different dye concentrations using collimated laser light (532 nm) passed through the dye volume. Two holograms without and with the UV laser beam were recorded. Intensity maps were calculated from the recorded digital holograms and are used to calculate the gain of the green laser beam due to the stimulated fluorescence emission which is coupled to the dye concentration. The gain of the coherent 532 nm beam is seen in the intensity maps and its value is about 40% for a dye concentration of 0.32 g/L and decreases with the decrease of the dye concentration. The results show that pulsed digital holography can be coupled to the stimulated LIF effect for imaging fluorescent species

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2013
Series
Proceedings of S P I E - International Society for Optical Engineering, ISSN 0277-786X ; 8788
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-34883 (URN)10.1117/12.2020505 (DOI)000323493700117 ()2-s2.0-84880727643 (Scopus ID)9322b9b9-5a8c-4d9a-865f-bf40637994f0 (Local ID)978-0-8194-9604-1 (ISBN)9322b9b9-5a8c-4d9a-865f-bf40637994f0 (Archive number)9322b9b9-5a8c-4d9a-865f-bf40637994f0 (OAI)
Conference
Optical Measurement Systems for Industrial Inspection : 13/05/2013 - 13/05/2013
Note

Validerad; 2013; Bibliografisk uppgift: Article number 87883M; 20130814 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-08-23Bibliographically approved
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