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@article{MAN_1877__11_156748, author = {Cayley}, title = {On the theory of {Partial} {Differential} {Equations}}, journal = {Mathematische Annalen}, pages = {194--198}, publisher = {mathdoc}, volume = {11}, year = {1877}, zbl = {09.0259.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1877__11_156748/} }
Cayley. On the theory of Partial Differential Equations. Mathematische Annalen, Tome 11 (1877), pp. 194-198. http://geodesic.mathdoc.fr/item/MAN_1877__11_156748/