Geodesic
Existence of a countable set of periodic, spherically symmetric solutions of a nonlinear wave equation
Izvestiya. Mathematics, Tome 38 (1992) no. 1, pp. 107-129 Cet article a éte moissonné depuis la source Math-Net.Ru

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Under suitable conditions countable solvability of the problem $-u_{tt}+\Delta u-g(u,r,t)=h(r,t)$ in $B_\pi$, $u(x,t)=u(x,t+T)$, $T>0$, $u(\partial B_\pi,t)=0$, where $B_\pi\subset\mathbf R^N$ is a ball of radius $\pi$, is proved. 
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I. A. Kuzin. Existence of a countable set of periodic, spherically symmetric solutions of a nonlinear wave equation. Izvestiya. Mathematics, Tome 38 (1992) no. 1, pp. 107-129. http://geodesic.mathdoc.fr/item/IM2_1992_38_1_a4/

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