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• Volume 33

Author: Chajda, Ivan

• Chajda, Ivan; Zelinka, Bohdan: Directly decomposable tolerances on direct products of lattices and semilattices. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 4, pp. 519-521
• Chajda, Ivan; Rachůnek, Jiří: Relational characterizations of permutable and $n$-permutable varieties. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 4, pp. 505-508