no. 1
A bifurcation theory for periodic solutions of nonlinear dissipative hyperbolic equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 10 (1983) no. 1, pp. 125-167. 
@article{ASNSP_1983_4_10_1_125_0,
     author = {Craig, W.},
     title = {A bifurcation theory for periodic solutions of nonlinear dissipative hyperbolic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {125--167},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 10},
     number = {1},
     year = {1983},
     zbl = {0518.35057},
     mrnumber = {713113},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1983_4_10_1_125_0/}
}
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UR  - https://zbmath.org/?q=an%3A0518.35057
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Craig, Walter. A bifurcation theory for periodic solutions of nonlinear dissipative hyperbolic equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 10 (1983) no. 1, pp. 125-167. http://www.numdam.org/item/ASNSP_1983_4_10_1_125_0/

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