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Osvald Demuth (1975)
Commentationes Mathematicae Universitatis Carolinae
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Osvald Demuth (1975)
Commentationes Mathematicae Universitatis Carolinae
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I. A. Černjavskaja (1972)
Commentationes Mathematicae Universitatis Carolinae
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Osvald Demuth (1976)
Commentationes Mathematicae Universitatis Carolinae
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