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Author: Chajda, Ivan

• Chajda, Ivan: Algebras whose principal congruences form a sublattice of the congruence lattice. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 4, pp. 585-588
• Chajda, Ivan; Zelinka, Bohdan: Tolerances and congruences on implication algebras. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 2, pp. 207-217
• Chajda, Ivan: Tolerances in congruence permutable algebras. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 2, pp. 218-225