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• Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
• Volume 35

Author: Chajda, Ivan

• Chajda, Ivan: Congruence semimodularity of conservative groupoids. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 35 (1996), issue 1, pp. 43-45
• Chajda, Ivan: Regularity and permutability via transferability of tolerances. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 35 (1996), issue 1, pp. 39-42