@article{105366, author = {Jaroslav Je\v zek}, title = {Upper semicomplements and a definable element in the lattice of groupoid varieties}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {012}, year = {1971}, pages = {565-586}, zbl = {0225.08007}, mrnumber = {0289398}, language = {en}, url = {http://dml.mathdoc.fr/item/105366} }
Ježek, Jaroslav. Upper semicomplements and a definable element in the lattice of groupoid varieties. Commentationes Mathematicae Universitatis Carolinae, Tome 012 (1971) pp. 565-586. http://gdmltest.u-ga.fr/item/105366/
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