no. 2
Asymptotic expansions of quasiperiodic solutions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 2, pp. 245-258. 
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     author = {Chierchia, L. and Zehnder, E.},
     title = {Asymptotic expansions of quasiperiodic solutions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {245--258},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 16},
     number = {2},
     year = {1989},
     mrnumber = {1041897},
     zbl = {0695.34040},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1989_4_16_2_245_0/}
}
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Chierchia, L.; Zehnder, E. Asymptotic expansions of quasiperiodic solutions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 2, pp. 245-258. http://archive.numdam.org/item/ASNSP_1989_4_16_2_245_0/

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