@article{GDZPPN002089734,
title = {The Invariance of Poincar\'e's Generating Function for Canonical Transformations.},
journal = {Inventiones mathematicae},
volume = {16},
year = {1972},
pages = {202-213},
zbl = {0235.70008},
url = {http://dml.mathdoc.fr/item/GDZPPN002089734}
}
Weinstein, Alan. The Invariance of Poincaré's Generating Function for Canonical Transformations.. Inventiones mathematicae, Tome 16 (1972) pp. 202-213. http://gdmltest.u-ga.fr/item/GDZPPN002089734/