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@article{MM2_1990__66_1_155480, author = {Patricio L. Felmer}, title = {Subharmonics near an equilibrium point for {Hamiltonian} systems.}, journal = {Manuscripta mathematica}, pages = {359--396}, publisher = {mathdoc}, volume = {66}, number = {1}, year = {1990}, zbl = {0688.34027}, url = {http://geodesic.mathdoc.fr/item/MM2_1990__66_1_155480/} }
Patricio L. Felmer. Subharmonics near an equilibrium point for Hamiltonian systems.. Manuscripta mathematica, Tome 66 (1990) no. 1, pp. 359-396. http://geodesic.mathdoc.fr/item/MM2_1990__66_1_155480/