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Amsterdam [u.a.]: North-Holland, 1990
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Bonn: Max-Planck-Institut für Mathematik, 1994
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Amsterdam; New York: North-Holland, 1990 ; New York: Distributors for the U.S. and Canada, Elsevier Science Pub. Co, 1990 ; Online-Ausg.]
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Freiburg: Universität, 2011
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Trier: Universität Trier, 2014
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2011
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Publication Server of Tier University (OPUS), 2014-07-17
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Universitäts- und Landesbibliothek Bonn, 2018-05-11
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JSTOR, 1977
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American Mathematical Society, 1977
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Informa UK Limited, 2020
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Institute of Mathematics, Polish Academy of Sciences, 2016
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Societatea de Ştiinţe Mathematice Din România, 2001
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SUT Journal of Mathematics - Tokyo University of Science, 1999
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JSTOR, 1977
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American Mathematical Society (AMS), 1977
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American Mathematical Society, 1977
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JSTOR, 1976
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American Mathematical Society (AMS), 1976