@article{1178243674, author = {Sasaki, Shigeo}, title = {A characterization of contact transformations}, journal = {Tohoku Math. J. (2)}, volume = {16}, number = {4}, year = {1964}, pages = { 285-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1178243674} }
Sasaki, Shigeo. A characterization of contact transformations. Tohoku Math. J. (2), Tome 16 (1964) no. 4, pp. 285-290. http://gdmltest.u-ga.fr/item/1178243674/