Berger, M. S. A Sturm-Liouville theorem for nonlinear elliptic partial differential equations. (English) Zbl 0173.43504 Proc. Natl. Acad. Sci. USA 53, 1277-1279 (1965). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 Documents Keywords:functional analysis PDF BibTeX XML Cite \textit{M. S. Berger}, Proc. Natl. Acad. Sci. USA 53, 1277--1279 (1965; Zbl 0173.43504) Full Text: DOI