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• Kepka, Tomáš; Kratochvíl, Jan: Graphs and associative triples in quasitrivial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 4, pp. 679-687
• Birkenmeier, Gary F.: Exponentiation without associativity. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 3-7
• Kepka, Tomáš: A note on subdirectly irreducible groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 25-28
• Kepka, Tomáš: On a class of groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 29-49
• Kepka, Tomáš: On a class of subdirectly irreducible groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 17-24
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of medial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 3, pp. 513-524
• Saade, Marshall: On some classes of point algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 1, pp. 33-36