scientific article; zbMATH DE number 3391363
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Publication:5660036
zbMath0247.35075MaRDI QIDQ5660036
Publication date: 1970
Full work available at URL: http://www.numdam.org/item?id=AIHPA_1970__12_1_71_0
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Partial differential equations of mathematical physics and other areas of application (35Q99) Second-order hyperbolic equations (35L10)
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