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M. Kinka
Faculty of Physics, Vilnius University, Sauletekio 9, 2040 Vilnius, Lithuania.
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J. Banys
Faculty of Physics, Vilnius University, Sauletekio 9, 2040 Vilnius, Lithuania.
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*R. Sobiestianskas
Faculty of Physics, Vilnius University, Sauletekio 9, 2040 Vilnius, Lithuania.
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G. Völkel
University of Leipzig, Faculty of Physics and Geoscience, Linnéstr. 5, D-04103 Leipzig, Germany.
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W. Böhlmann
University of Leipzig, Faculty of Physics and Geoscience, Linnéstr. 5, D-04103 Leipzig, Germany.
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M. Hartmann
Department of Chemistry, Chemical Technology, University of Kaiserslautern, Erwin-Schrodinger-Str. 54, D-67663 Kaiserslautern, Germany.
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A. Pöppl
University of Leipzig, Faculty of Physics and Geoscience, Linnéstr. 5, D-04103 Leipzig, Germany.