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@article{IM_1973__20_142203, author = {Alan Weinstein}, title = {Normal {Modes} for {Nonlinear} {Hamiltonian} {Systems.}}, journal = {Inventiones mathematicae}, pages = {47--58}, publisher = {mathdoc}, volume = {20}, year = {1973}, zbl = {0264.70020}, url = {http://geodesic.mathdoc.fr/item/IM_1973__20_142203/} }
Alan Weinstein. Normal Modes for Nonlinear Hamiltonian Systems.. Inventiones mathematicae, Tome 20 (1973), pp. 47-58. http://geodesic.mathdoc.fr/item/IM_1973__20_142203/