@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/