Geodesic
Upper semicomplements and a definable element in the lattice of groupoid varieties
Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 3, pp. 565-586.

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Classification : 06B99, 08-30, 08A15, 08B15, 20-00, 20M14 
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     title = {Upper semicomplements and a definable element in the lattice of groupoid varieties},
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Ježek, Jaroslav. Upper semicomplements and a definable element in the lattice of groupoid varieties. Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 3, pp. 565-586. http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a8/