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Bohdan Zelinka (1968)
Commentationes Mathematicae Universitatis Carolinae
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Bohdan Zelinka (1968)
Commentationes Mathematicae Universitatis Carolinae
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Milan Koman (1970)
Commentationes Mathematicae Universitatis Carolinae
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Heinz-Jürgen Voss (1977)
Commentationes Mathematicae Universitatis Carolinae
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