@article{PSMIR_1975___S4_A27_0, author = {Zenhder, E.}, title = {Hamiltonian Systems Close to Integrable Systems}, journal = {Publications math\'ematiques et informatique de Rennes}, eid = {27}, publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes}, number = {S4}, year = {1975}, language = {en}, url = {www.numdam.org/item/PSMIR_1975___S4_A27_0/} }
Zenhder, E. Hamiltonian Systems Close to Integrable Systems. Publications mathématiques et informatique de Rennes, no. S4 (1975), article no. 27, 12 p. http://www.numdam.org/item/PSMIR_1975___S4_A27_0/
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