@article{1183425456, author = {Lipka, Joseph}, title = {Note on velocity systems in curved space of $N$ dimensions}, journal = {Bull. Amer. Math. Soc.}, volume = {27}, number = {3}, year = {1920}, pages = { 71-77}, language = {en}, url = {http://dml.mathdoc.fr/item/1183425456} }
Lipka, Joseph. Note on velocity systems in curved space of $N$ dimensions. Bull. Amer. Math. Soc., Tome 27 (1920) no. 3, pp. 71-77. http://gdmltest.u-ga.fr/item/1183425456/