@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'I.H.P. Analyse non lin\'eaire},
     pages = {359--409},
     publisher = {Gauthier-Villars},
     volume = {11},
     number = {4},
     year = {1994},
     mrnumber = {1287238},
     zbl = {0838.58030},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1994__11_4_359_0/}
}