Yakovlev, G. N. Differential properties of extremals of quadratic functionals with discontinuous coefficients. (Russian) Zbl 0235.35030 Differ. Uravn. 7, 1288-1293 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 35J35 Variational methods for higher-order elliptic equations 35R05 PDEs with low regular coefficients and/or low regular data PDF BibTeX XML Cite \textit{G. N. Yakovlev}, Differ. Uravn. 7, 1288--1293 (1971; Zbl 0235.35030) OpenURL