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1985 Infinitely many periodic solutions for the equation: $u_{tt} - u_{xx} \pm \left| u \right|^{s - 1} u = f\left( {x,t} \right)$
Kazunaga Tanaka
Proc. Japan Acad. Ser. A Math. Sci. 61(3): 70-73 (1985). DOI: 10.3792/pjaa.61.70
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Vol.61 • No. 3 • 1985
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