Periodic solutions of asymptotically linear systems without symmetry
Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 147-161. 
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     author = {Salvatore, A.},
     title = {Periodic solutions of asymptotically linear systems without symmetry},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {147--161},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {74},
     year = {1985},
     mrnumber = {818724},
     zbl = {0592.34030},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1985__74__147_0/}
}
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Salvatore, A. Periodic solutions of asymptotically linear systems without symmetry. Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 147-161. http://archive.numdam.org/item/RSMUP_1985__74__147_0/

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