Geodesic
The number of minimal varieties of idempotent groupoids
Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 1, pp. 199-205

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Classification : 08B05, 08B15, 08B99, 20N99 
Ježek, Jaroslav. The number of minimal varieties of idempotent groupoids. Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 1, pp. 199-205. http://geodesic.mathdoc.fr/item/CMUC_1982_23_1_a17/
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     zbl = {0502.08008},
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     url = {http://geodesic.mathdoc.fr/item/CMUC_1982_23_1_a17/}
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