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Periodic solutions of a weakly nonlinear wave equation in $$E_ 3$$ in a spherically symmetrical case. (English) Zbl 0175.39504

##### Keywords:
partial differential equations
Full Text:
##### References:
 [1] O. Vejvoda: Periodic solutions of a linear and weakly nonlinear wave equation in one dimension, I. Czechoslovak Math. Journal, 14 (89), 1964, 341-382. · Zbl 0178.45302 · eudml:12225
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