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Author: Chajda, Ivan

• Chajda, Ivan; Emanovský, Petr: Modularity and distributivity of the lattice of $\Sigma$-closed subsets of an algebraic structure. (English). Mathematica Bohemica, vol. 120 (1995), issue 2, pp. 209-217
• Chajda, Ivan; Emanovský, Petr: $\Sigma$-isomorphic algebraic structures. (English). Mathematica Bohemica, vol. 120 (1995), issue 1, pp. 71-81