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Antonín Sochor, Petr Vopěnka (1980)
Commentationes Mathematicae Universitatis Carolinae
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Antonín Sochor, Petr Vopěnka (1980)
Commentationes Mathematicae Universitatis Carolinae
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Karel Čuda (1980)
Commentationes Mathematicae Universitatis Carolinae
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Antonín Sochor, Petr Vopěnka (1979)
Commentationes Mathematicae Universitatis Carolinae
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