Gårding, Lars Le problème de la dérivée oblique pour l’équation des ondes. (French) Zbl 0386.35024 C. R. Acad. Sci., Paris, Sér. A 285, 773-775 (1977). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 2 Documents MSC: 35L05 Wave equation 35A30 Geometric theory, characteristics, transformations in context of PDEs PDF BibTeX XML Cite \textit{L. Gårding}, C. R. Acad. Sci., Paris, Sér. A 285, 773--775 (1977; Zbl 0386.35024)