@article{102456, author = {J\'ozef Dudek}, title = {Medial idempotent groupoids. I}, journal = {Czechoslovak Mathematical Journal}, volume = {41}, year = {1991}, pages = {249-259}, zbl = {0738.20061}, mrnumber = {1105439}, language = {en}, url = {http://dml.mathdoc.fr/item/102456} }
Dudek, Józef. Medial idempotent groupoids. I. Czechoslovak Mathematical Journal, Tome 41 (1991) pp. 249-259. http://gdmltest.u-ga.fr/item/102456/
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