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• Acta Universitatis Carolinae. Mathematica et Physica
• Volume 48

Author: Trch, Milan

• Trch, Milan: Groupoids and the associative law VIIA. (SH-groupoids of type (A, B, A) and their semigroup distances). (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 48 (2007), issue 1, pp. 43-54