@article{ASNSP_1996_4_23_1_119_0,
     author = {P\"oschel, J\"urgen},
     title = {A {KAM-theorem} for some nonlinear partial differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {119--148},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 23},
     number = {1},
     year = {1996},
     mrnumber = {1401420},
     zbl = {0870.34060},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1996_4_23_1_119_0/}
}