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@article{MZ_1994__216_4_174660, author = {J\"urgen Moser}, title = {On quadratic symplectic mappings.}, journal = {Mathematische Zeitschrift}, pages = {417--430}, publisher = {mathdoc}, volume = {216}, number = {4}, year = {1994}, zbl = {0806.58024}, url = {http://geodesic.mathdoc.fr/item/MZ_1994__216_4_174660/} }
Jürgen Moser. On quadratic symplectic mappings.. Mathematische Zeitschrift, Tome 216 (1994) no. 4, pp. 417-430. http://geodesic.mathdoc.fr/item/MZ_1994__216_4_174660/