Hamiltonian Systems Close to Integrable Systems
Publications des séminaires de mathématiques et informatique de Rennes, International Conference on Dynamical Systems in Mathematical Physics, no. S4 (1975), article no. 27, 12 p. 
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     author = {Zenhder, E.},
     title = {Hamiltonian {Systems} {Close} to {Integrable} {Systems}},
     journal = {Publications des s\'eminaires de math\'ematiques et informatique de Rennes},
     eid = {27},
     pages = {1--12},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {S4},
     year = {1975},
     language = {en},
     url = {http://archive.numdam.org/item/PSMIR_1975___S4_A27_0/}
}
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Zenhder, E. Hamiltonian Systems Close to Integrable Systems. Publications des séminaires de mathématiques et informatique de Rennes, International Conference on Dynamical Systems in Mathematical Physics, no. S4 (1975), article  no. 27, 12 p. http://archive.numdam.org/item/PSMIR_1975___S4_A27_0/

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