@article{01413876, title = {Schwarzian derivatives of contact diffeomorphisms.}, journal = {Lobachevskii Journal of Mathematics}, volume = {3}, year = {1999}, pages = {89-98}, zbl = {1044.53516}, language = {en}, url = {http://dml.mathdoc.fr/item/01413876} }
Sato, H. Schwarzian derivatives of contact diffeomorphisms.. Lobachevskii Journal of Mathematics, Tome 3 (1999) pp. 89-98. http://gdmltest.u-ga.fr/item/01413876/