no. 4
Lyapunov center theorem for some nonlinear PDE's : a simple proof
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 29 (2000) no. 4, pp. 823-837. 
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Bambusi, Dario. Lyapunov center theorem for some nonlinear PDE's : a simple proof. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 29 (2000) no. 4, pp. 823-837. http://www.numdam.org/item/ASNSP_2000_4_29_4_823_0/

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