Coddington, E. A.; Levinson, N. On the nature of the spectrum of singular second order linear differential equations. (English) Zbl 0042.32602 Can. J. Math. 3, 335-338 (1951). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 779 Documents Keywords:ordinary differential equations PDF BibTeX XML Cite \textit{E. A. Coddington} and \textit{N. Levinson}, Can. J. Math. 3, 335--338 (1951; Zbl 0042.32602) Full Text: DOI