Boundedness of solutions via the twist-theorem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 1, pp. 79-95. 
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     title = {Boundedness of solutions via the twist-theorem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {79--95},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {1},
     year = {1987},
     mrnumber = {937537},
     zbl = {0656.34027},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1987_4_14_1_79_0/}
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Dieckerhoff, R.; Zehnder, E. Boundedness of solutions via the twist-theorem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 1, pp. 79-95. http://www.numdam.org/item/ASNSP_1987_4_14_1_79_0/

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