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@article{10_21136_CMJ_1991_102456, author = {Dudek, J\'ozef}, title = {Medial idempotent groupoids. {I}}, journal = {Czechoslovak Mathematical Journal}, pages = {249--259}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1991}, doi = {10.21136/CMJ.1991.102456}, mrnumber = {1105439}, zbl = {0738.20061}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102456/} }
Dudek, Józef. Medial idempotent groupoids. I. Czechoslovak Mathematical Journal, Tome 41 (1991) no. 2, pp. 249-259. doi : 10.21136/CMJ.1991.102456. http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102456/
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