Feller, William Generalized second order differential operators and their lateral conditions. (English) Zbl 0077.29102 Ill. J. Math. 1, 459-504 (1957). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 65 Documents Keywords:Ordinary Differential Equations; Difference Equations PDF BibTeX XML Cite \textit{W. Feller}, Ill. J. Math. 1, 459--504 (1957; Zbl 0077.29102)