Pólya, George Estimates for eigenvalues. (English) Zbl 0056.32401 Studies Math. Mech., presented to Richard von Mises, 200-207 (1954). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Partial differential equations PDFBibTeX XML