@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/