no. S4
Hamiltonian Systems Close to Integrable Systems
Publications des séminaires de mathématiques et informatique de Rennes, 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, no. S4 (1975), article  no. 27, 12 p. http://archive.numdam.org/item/PSMIR_1975___S4_A27_0/

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2] S. Graff:" On the conservation of hyperbolic invariant tori for Hamiltonian systems". Journal of Diff. Equations, 15, pp. 1 - 69 . , 1974. | MR | Zbl

3] N. Nekhoroshev:"Behaviour of Hamiltonian systems close to integrable." Announced in Functional Anal.Appl.5, 333-339, 1971. | Zbl

4] E. Zehnder:"Generalized implicit function theorems with Applications to some small divisor problems I". Comm. Pure and Appl. Math. Vol XXVIII pp.91 - 140, 1975. | MR | Zbl

5] E. Zehnder:"Unstable phenomena at stable equilibrium points". In preparation.