Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1980__32_154723, author = {Herbert Amann and Eduard Zehnder}, title = {Periodic {Solutions} of {Asymptotically} {Linear} {Hamiltonian} {Systems.}}, journal = {Manuscripta mathematica}, pages = {149--190}, publisher = {mathdoc}, volume = {32}, year = {1980}, zbl = {0443.70019}, url = {http://geodesic.mathdoc.fr/item/MM2_1980__32_154723/} }
Herbert Amann; Eduard Zehnder. Periodic Solutions of Asymptotically Linear Hamiltonian Systems.. Manuscripta mathematica, Tome 32 (1980), pp. 149-190. http://geodesic.mathdoc.fr/item/MM2_1980__32_154723/