A direct proof of a theorem by Kolmogorov in hamiltonian systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 4, pp. 541-593. 
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     title = {A direct proof of a theorem by {Kolmogorov} in hamiltonian systems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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Chierchia, L.; Falcolini, C. A direct proof of a theorem by Kolmogorov in hamiltonian systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 4, pp. 541-593. http://archive.numdam.org/item/ASNSP_1994_4_21_4_541_0/

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