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Trier: Universität Trier, 2022
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Trier: Universität Trier, 2014
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Trier: Universität Trier, 2022
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Publication Server of Tier University (OPUS), 2022-09-19
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Elsevier BV, 2009
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Elsevier BV, 1977
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Springer Science and Business Media LLC, 2009
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Cambridge University Press (CUP), 2008
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Michigan Mathematical Journal, 1995
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IOP Publishing, 1984
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Springer Science and Business Media LLC, 2019
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Springer Science and Business Media LLC, 2018
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Springer Science and Business Media LLC, 2018
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National Library of Serbia, 2016
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Faculty of Sciences and Mathematics, University of Niš, 2016
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Springer Science and Business Media LLC, 2011
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Elsevier BV, 2010
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Elsevier BV, 2005
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Science Publications, 2005
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Elsevier BV, 1995