scientific article; zbMATH DE number 4188306
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Publication:5752908
zbMath0721.35011MaRDI QIDQ5752908
Publication date: 1990
Full work available at URL: https://eudml.org/doc/233684
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Smoothness and regularity of solutions to PDEs (35B65) Second-order nonlinear hyperbolic equations (35L70) Wave equation (35L05)
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