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• Drápal, A.; Kepka, T.: Exchangeable partial groupoids II. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 26 (1985), issue 1, pp. 3-9
• Kepka, Tomáš: Distributive groupoids and preradicals. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 1, pp. 183-197
• Kepka, Tomáš: Distributive groupoids and preradicals. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 2, pp. 199-209