Category bases.
Detlefsen, M., Szymański, Andrzej (1993)
International Journal of Mathematics and Mathematical Sciences
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Detlefsen, M., Szymański, Andrzej (1993)
International Journal of Mathematics and Mathematical Sciences
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Malgorzata Filipczak (1992)
Czechoslovak Mathematical Journal
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Harry I. Miller (1981)
Časopis pro pěstování matematiky
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