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• Volume 31

Author: Ježek, Jaroslav

• Ježek, Jaroslav: The lattice of equational theories. Part I: Modular elements. (English). Czechoslovak Mathematical Journal, vol. 31 (1981), issue 1, pp. 127-152
• Ježek, Jaroslav: The lattice of equational theories. Part II: The lattice of full sets of terms. (English). Czechoslovak Mathematical Journal, vol. 31 (1981), issue 4, pp. 573-603