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Budapest: Vectori K., 1991
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University of Debrecen/ Debreceni Egyetem, 1993
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MDPI AG, 2022
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MDPI AG, 2022
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University of Pannonia, 2022
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IBIMA Publishing, 2021
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2018
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American Mathematical Society, 2003
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American Mathematical Society (AMS), 2003
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Springer Science and Business Media LLC, 2002
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Elsevier BV, 2002
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Elsevier BV, 1989
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2019
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University of Pannonia, 2016
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Wiley, 2003
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Wiley, 1999
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Wiley, 1999
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Scientific Research Publishing, Inc., 2017
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Informa UK Limited, 2017
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Babes-Bolyai University, 2017