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New York; Oxford [u.a.]: Pergamon Pr., 1961
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Berlin: Dt. Verl. der Wiss., 1960
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Springer Science and Business Media LLC, 1991
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Springer Science and Business Media LLC, 1982
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Springer Science and Business Media LLC, 1962
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Springer Science and Business Media LLC, 1981
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Institute of Mathematics, Polish Academy of Sciences, 1963