Stenger, William On the variational principles for eigenvalues for a class of unbounded operators. (English) Zbl 0157.21302 J. Math. Mech. 17, 641-648 (1968). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 9 Documents Keywords:functional analysis PDFBibTeX XMLCite \textit{W. Stenger}, J. Math. Mech. 17, 641--648 (1968; Zbl 0157.21302)