Geodesic
Quasi-periodic oscillations for wave equations under periodic forcing
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 16 (2005) no. 2, pp. 109-116.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

Existence of quasi-periodic solutions with two frequencies of completely resonant, periodically forced, nonlinear wave equations with periodic spatial boundary conditions is established. We consider both the cases the forcing frequency is (Case A) a rational number and (Case B) an irrational number.
Si dimostra l'esistenza di soluzioni quasi periodiche con due frequenze per una classe di equazioni delle onde non lineari completamente risonanti aventi un termine forzante periodico. Consideriamo che la frequenza forzante sia un numero razionale (Caso A), sia irrazionale (Caso B). 
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Berti, Massimiliano; Procesi, Michela. Quasi-periodic oscillations for wave equations under periodic forcing. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 16 (2005) no. 2, pp. 109-116. http://geodesic.mathdoc.fr/item/RLIN_2005_9_16_2_a2/

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