@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/}
}