Permutable groupoids
Jaroslav Ježek, Tomáš Kepka (1984)
Czechoslovak Mathematical Journal
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Jaroslav Ježek, Tomáš Kepka (1984)
Czechoslovak Mathematical Journal
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Jaroslav Ježek, Tomáš Kepka (1989)
Czechoslovak Mathematical Journal
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Tomáš Kepka (1978)
Acta Universitatis Carolinae. Mathematica et Physica
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