@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/