no. 4
Plenty of elliptic islands for the standard family of area preserving maps
Annales de l'Institut Henri Poincaré. C, Analyse non linéaire, Tome 11 (1994) no. 4, pp. 359-409 
@article{AIHPC_1994__11_4_359_0,
     author = {Duarte, Pedro},
     title = {Plenty of elliptic islands for the standard family of area preserving maps},
     journal = {Annales de l'Institut Henri Poincar\'e. C, Analyse non lin\'eaire},
     pages = {359--409},
     year = {1994},
     publisher = {Gauthier-Villars},
     volume = {11},
     number = {4},
     mrnumber = {1287238},
     zbl = {0838.58030},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1994__11_4_359_0/}
}
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Duarte, Pedro. Plenty of elliptic islands for the standard family of area preserving maps. Annales de l'Institut Henri Poincaré. C, Analyse non linéaire, Tome 11 (1994) no. 4, pp. 359-409. https://www.numdam.org/item/AIHPC_1994__11_4_359_0/

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