Titchmarsh, E. C. Eigenfunction expansions associated with second-order differential equations. Part I. 2nd ed. (English) Zbl 0099.05201 Oxford: At the Clarendon Press. 203 p. (1962). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 ReviewsCited in 427 Documents Keywords:approximation and series expansion PDF BibTeX XML