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@article{CMH_1989__64_1_140144, author = {Eduard Zehnder and Dietmar Salamon}, title = {KAM theory in configuration space.}, journal = {Commentarii mathematici Helvetici}, pages = {84--132}, publisher = {mathdoc}, volume = {64}, number = {1}, year = {1989}, zbl = {0682.58014}, url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140144/} }
Eduard Zehnder; Dietmar Salamon. KAM theory in configuration space.. Commentarii mathematici Helvetici, Tome 64 (1989) no. 1, pp. 84-132. http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140144/