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@article{CMH_1993__68_2_140293, author = {H. Hofer}, title = {Estimates for the energy of a symplectic map.}, journal = {Commentarii mathematici Helvetici}, pages = {48--72}, publisher = {mathdoc}, volume = {68}, number = {2}, year = {1993}, zbl = {0787.58017}, url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140293/} }
H. Hofer. Estimates for the energy of a symplectic map.. Commentarii mathematici Helvetici, Tome 68 (1993) no. 2, pp. 48-72. http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140293/