MathSciNet bibliographic data MR940220 35B10 (35L70 58E05 58G16) Tanaka, Kazunaga Infinitely many periodic solutions for the equation: $u_{tt}-u_{xx}\pm |u|^{p-1}u=f(x,t)$$u_{tt}-u_{xx}\pm |u|^{p-1}u=f(x,t)$. II. Trans. Amer. Math. Soc. 307 (1988), no. 2, 615–645. Article

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