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@article{10_4064_cm_21_1_35_37, author = {J. P{\l}onka}, title = {On the arity of idempotent reducts of groups}, journal = {Colloquium Mathematicum}, pages = {35--37}, publisher = {mathdoc}, volume = {21}, number = {1}, year = {1970}, doi = {10.4064/cm-21-1-35-37}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-21-1-35-37/} }
J. Płonka. On the arity of idempotent reducts of groups. Colloquium Mathematicum, Tome 21 (1970) no. 1, pp. 35-37. doi : 10.4064/cm-21-1-35-37. http://geodesic.mathdoc.fr/articles/10.4064/cm-21-1-35-37/
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