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08A15 

• Volkov, Michael V.: Varieties of associative rings closed under ideal sums. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 1, pp. 101-103
• Cornish, William H.: Amalgamating commutative regular rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 3, pp. 423-436
• Kepka, Tomáš: Epimorphisms in some groupoid varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 2, pp. 265-279
• Rosický, Jiří: One obstruction for closedness. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 2, pp. 311-318
• Gardner, Barry J.: Ring varieties closed under ideal sums. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 3, pp. 569-578
• Ježek, Jaroslav: Varieties of algebras with equationally definable zeros. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 3, pp. 394-414
• Ježek, Jaroslav: EDZ-varieties: The Schreier property and epimorphisms onto. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 17 (1976), issue 2, pp. 281-290
• Kozák, Miroslav: Finiteness conditions on EDZ-varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 17 (1976), issue 3, pp. 461-472
• Ježek, J.; Kepka, Tomáš: Extensive varieties. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 16 (1975), issue 2, pp. 79-87
• Ježek, Jaroslav; Kepka, Tomáš: Quasigroups, isotopic to a group. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 16 (1975), issue 1, pp. 59-76
• Mederly, Peter: Three Mal'cev Type Theorems and their Application. (English). Matematický časopis, vol. 25 (1975), issue 1, pp. 83-95
• Draškovičová, Hilda: Independence of Equational Classes. (English). Matematický časopis, vol. 23 (1973), issue 2, pp. 125-135
• Ježek, Jaroslav: The existence of upper semicomplements in lattices of primitive classes. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 3, pp. 519-532
• Ježek, Jaroslav: Upper semicomplements and a definable element in the lattice of groupoid varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 3, pp. 565-586