Titchmarsh, E. C. Eigenfunction expansions associated with second-order differential equations. Vol. II. (English) Zbl 0097.27601 Oxford: At the Clarendon Press. XI, 404 p. (1958). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 235 Documents Keywords:approximation and series expansion PDF BibTeX XML OpenURL