MathSciNet bibliographic data MR824205 (87g:35159) 35L70 (35L15) Schaeffer, Jack The equation \$u\sb {tt}-\Delta u=\vert u\vert \sp p\$$u\sb {tt}-\Delta u=\vert u\vert \sp p$ for the critical value of \$p\$$p$. Proc. Roy. Soc. Edinburgh Sect. A 101 (1985), no. 1-2, 31–44. Article

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