@article{106145, author = {Jaroslav Je\v zek}, title = {The number of minimal varieties of idempotent groupoids}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {023}, year = {1982}, pages = {199-205}, zbl = {0502.08008}, mrnumber = {653364}, language = {en}, url = {http://dml.mathdoc.fr/item/106145} }
Ježek, Jaroslav. The number of minimal varieties of idempotent groupoids. Commentationes Mathematicae Universitatis Carolinae, Tome 023 (1982) pp. 199-205. http://gdmltest.u-ga.fr/item/106145/
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