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G. M. Nepomnyashchij, Jurij Michailov Smirnov (1979)
Czechoslovak Mathematical Journal
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G. M. Nepomnyashchij, Jurij Michailov Smirnov (1979)
Czechoslovak Mathematical Journal
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М. Катетов (1962)
Fundamenta Mathematicae
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G. M. Nepomnyashchij (1979)
Czechoslovak Mathematical Journal
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С. Богатый, Ю. Смирнов (1975)
Fundamenta Mathematicae
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Б. Левшенко (1970)
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Anton Kotzig (1968)
Czechoslovak Mathematical Journal
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