Mel’nik, Z. O. Über hyperbolische Gleichungen mit mehrfachen Charakteristiken. (Russian) Zbl 0287.35066 Differ. Uravn. 10, 1530-1532 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 35L35 Initial-boundary value problems for higher-order hyperbolic equations 35A30 Geometric theory, characteristics, transformations in context of PDEs PDF BibTeX XML Cite \textit{Z. O. Mel'nik}, Differ. Uravn. 10, 1530--1532 (1974; Zbl 0287.35066) OpenURL