@article{GDZPPN002277867, title = {Separable systems in classical and wave mechanics.}, journal = {Mathematische Annalen}, volume = {111}, year = {1935}, pages = {459-468}, zbl = {0012.08906}, url = {http://dml.mathdoc.fr/item/GDZPPN002277867} }
Madhava Rao, B.S. Separable systems in classical and wave mechanics.. Mathematische Annalen, Tome 111 (1935) pp. 459-468. http://gdmltest.u-ga.fr/item/GDZPPN002277867/