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@article{10_4064_cm_81_1_63_87, author = {J. Ga{\l}uszka}, title = {Varieties of idempotent groupoids with small clones}, journal = {Colloquium Mathematicum}, pages = {63--87}, publisher = {mathdoc}, volume = {81}, number = {1}, year = {1999}, doi = {10.4064/cm-81-1-63-87}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-81-1-63-87/} }
J. Gałuszka. Varieties of idempotent groupoids with small clones. Colloquium Mathematicum, Tome 81 (1999) no. 1, pp. 63-87. doi : 10.4064/cm-81-1-63-87. http://geodesic.mathdoc.fr/articles/10.4064/cm-81-1-63-87/
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