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MathSciNet review: 1565059
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Author: E. C. Titchmarsh
Title: Eigenfunction expansions associated with second order differential equations
Additional book information: Oxford, Clarendon Press, 1946. 8+174 pp. $7.00.
Reviewer: W. J. Trjitzinsky
Journal: Bull. Amer. Math. Soc. 54 (1948), 485-487