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Author: Drápal, A.

• Drápal, A.; Ježek, J.; Kepka, T.: Groupoids and the associative law IX. (Associative triples in some classes of groupoids). (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 38 (1997), issue 1, pp. 39-52
• Drápal, A.; Kepka, T.: Groupoids and the associative law VIII. (Diagonally Non-Associative Groupoids). (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 38 (1997), issue 1, pp. 23-37
• Bican, L.; Drápal, A.; Kepka, T.: Cancellative relations and matrices. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 28 (1987), issue 1, pp. 21-31
• Drápal, A.; Kepka, T.: Exchangeable partial groupoids II. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 26 (1985), issue 1, pp. 3-9
• Drápal, A.; Kepka, T.: Exchangeable partial groupoids I. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 57-72