@article{JRAM_1877__83_148335,
     author = {A. Cayley},
     title = {Further investigations on the double ...-functions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {220--233},
     publisher = {mathdoc},
     volume = {83},
     year = {1877},
     zbl = {09.0366.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1877__83_148335/}
}