@article{GDZPPN002067072,
title = {KAM theory in configuration space.},
journal = {Commentarii mathematici Helvetici},
volume = {64},
year = {1989},
pages = {84-132},
zbl = {0682.58014},
url = {http://dml.mathdoc.fr/item/GDZPPN002067072}
}
Zehnder, Eduard; Salamon, Dietmar. KAM theory in configuration space.. Commentarii mathematici Helvetici, Tome 64 (1989) pp. 84-132. http://gdmltest.u-ga.fr/item/GDZPPN002067072/