On a theorem of M. Katětov
Stanislav Tomášek (1966)
Commentationes Mathematicae Universitatis Carolinae
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Stanislav Tomášek (1966)
Commentationes Mathematicae Universitatis Carolinae
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Josef Daneš (1977)
Commentationes Mathematicae Universitatis Carolinae
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Ho Duc Viet (1975)
Commentationes Mathematicae Universitatis Carolinae
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