Geodesic
Convergence of Birkhoff normal forms for integrable systems.
Commentarii mathematici Helvetici, Tome 64 (1989) no. 1, pp. 412-461

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Zbl
Mots-clés : Birkhoff normal forms, Hamiltonian systems, equilibrium point, periodic motion 
Hidekazu Ito. Convergence of Birkhoff normal forms for integrable systems.. Commentarii mathematici Helvetici, Tome 64 (1989) no. 1, pp. 412-461. http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140164/
@article{CMH_1989__64_1_140164,
     author = {Hidekazu Ito},
     title = {Convergence of {Birkhoff} normal forms for integrable systems.},
     journal = {Commentarii mathematici Helvetici},
     pages = {412--461},
     year = {1989},
     volume = {64},
     number = {1},
     zbl = {0686.58021},
     url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140164/}
}
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