Commutative distributive groupoids
Tomáš Kepka (1978)
Acta Universitatis Carolinae. Mathematica et Physica
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Tomáš Kepka (1978)
Acta Universitatis Carolinae. Mathematica et Physica
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Tomáš Kepka (1981)
Acta Universitatis Carolinae. Mathematica et Physica
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Tomáš Kepka (1983)
Acta Universitatis Carolinae. Mathematica et Physica
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