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• Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

Author: Graczyńska, Ewa

• Chajda, Ivan; Graczyńska, Ewa: Algebras presented by normal identities. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 38 (1999), issue 1, pp. 49-58