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• Volume 41

Author: Chajda, Ivan

• Chajda, Ivan: Varieties having distributive lattices of quasiorders. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 1, pp. 85-89
• Chajda, Ivan: Weak coherence of congruences. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 1, pp. 149-154