Eighty years of Professor Štefan Schwarz
Ján Jakubík, Milan Kolibiar (1994)
Mathematica Slovaca
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Ján Jakubík, Milan Kolibiar (1994)
Mathematica Slovaca
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Beloslav Riečan (1997)
Czechoslovak Mathematical Journal
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Ján Jakubík, Milan Kolibiar (1974)
Czechoslovak Mathematical Journal
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