Periodic solutions of perturbed superquadratic hamiltonian systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 35-77. 
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     author = {Long, Yiming},
     title = {Periodic solutions of perturbed superquadratic hamiltonian systems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {35--77},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 17},
     number = {1},
     year = {1990},
     mrnumber = {1074626},
     zbl = {0724.34052},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1990_4_17_1_35_0/}
}
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Long, Yiming. Periodic solutions of perturbed superquadratic hamiltonian systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 35-77. http://archive.numdam.org/item/ASNSP_1990_4_17_1_35_0/

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