@article{GDZPPN002297426, title = {Convergent Series Expansions for Quasi-Periodic Motions.}, journal = {Mathematische Annalen}, volume = {174}, year = {1967}, pages = {136-176}, zbl = {0149.29903}, url = {http://dml.mathdoc.fr/item/GDZPPN002297426} }
Moser, J. Convergent Series Expansions for Quasi-Periodic Motions.. Mathematische Annalen, Tome 174 (1967) pp. 136-176. http://gdmltest.u-ga.fr/item/GDZPPN002297426/