@article{1183503896,
author = {Ostrowski, Alexander},
title = {On the definition of contact transformations},
journal = {Bull. Amer. Math. Soc.},
volume = {47},
number = {11},
year = {1941},
pages = { 760-763},
language = {en},
url = {http://dml.mathdoc.fr/item/1183503896}
}
Ostrowski, Alexander. On the definition of contact transformations. Bull. Amer. Math. Soc., Tome 47 (1941) no. 11, pp. 760-763. http://gdmltest.u-ga.fr/item/1183503896/