@article{JRAM_1878__85_148374,
     author = {A. Cayley},
     title = {A memoir on the double ...-functions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {214--245},
     publisher = {mathdoc},
     volume = {85},
     year = {1878},
     zbl = {10.0324.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1878__85_148374/}
}