Author: 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
- : 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
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