Normal congruence relations on division groupoids
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Tomáš Kepka (1975)
Acta Universitatis Carolinae. Mathematica et Physica
Bourn, Dominique (2000)
Theory and Applications of Categories [electronic only]
Brown, R., Sivera, R. (2007)
Journal of Homotopy and Related Structures
Tomáš Kepka (1981)
Acta Universitatis Carolinae. Mathematica et Physica
Jaroslav Ježek, Tomáš Kepka (1983)
Commentationes Mathematicae Universitatis Carolinae
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