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@article{MAN_1878__13_156817, author = {Cayley}, title = {A theorem on groups}, journal = {Mathematische Annalen}, pages = {561--565}, publisher = {mathdoc}, volume = {13}, year = {1878}, zbl = {10.0105.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1878__13_156817/} }
Cayley. A theorem on groups. Mathematische Annalen, Tome 13 (1878), pp. 561-565. http://geodesic.mathdoc.fr/item/MAN_1878__13_156817/