Hopf, Eberhard A remark on linear elliptic differential equations of second order. (English) Zbl 0048.07802 Proc. Am. Math. Soc. 3, 791-793 (1952). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 109 Documents Keywords:partial differential equations PDFBibTeX XMLCite \textit{E. Hopf}, Proc. Am. Math. Soc. 3, 791--793 (1952; Zbl 0048.07802) Full Text: DOI