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• Acta Universitatis Carolinae. Mathematica et Physica

Author: Trch, M.

• Kepka, T.; Trch, M.: Groupoids and the associative law VI. (Szász-Hájek groupoids of type (a, b, c)). (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 38 (1997), issue 1, pp. 13-22