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• Volume 39

Author: Duda, Jaromír

• Duda, Jaromír: Principal congruence relations and principal tolerances on varieties of lattices. (English). Mathematica Slovaca, vol. 39 (1989), issue 4, pp. 365-369
• Chajda, Ivan; Duda, Jaromír: Varieties satisfying ideal equalities. (English). Mathematica Slovaca, vol. 39 (1989), issue 1, pp. 55-63