@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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