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@article{10_4064_cm_21_2_179_186, author = {Ernest P{\l}onka}, title = {Symmetric operations in groups}, journal = {Colloquium Mathematicum}, pages = {179--186}, publisher = {mathdoc}, volume = {21}, number = {2}, year = {1970}, doi = {10.4064/cm-21-2-179-186}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-21-2-179-186/} }
Ernest Płonka. Symmetric operations in groups. Colloquium Mathematicum, Tome 21 (1970) no. 2, pp. 179-186. doi : 10.4064/cm-21-2-179-186. http://geodesic.mathdoc.fr/articles/10.4064/cm-21-2-179-186/
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