@article{GDZPPN002259273,
title = {On the partial differential equations of mathematical physics.},
journal = {Mathematische Annalen},
volume = {56},
year = {1903},
pages = {333-355},
zbl = {34.0827.01},
url = {http://dml.mathdoc.fr/item/GDZPPN002259273}
}
Whittaker, E.T. On the partial differential equations of mathematical physics.. Mathematische Annalen, Tome 56 (1903) pp. 333-355. http://gdmltest.u-ga.fr/item/GDZPPN002259273/