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Introduction to spectral theory: Selfadjoint ordinary differential operators. Translated from the Russian by Amiel Feinstein. (English) Zbl 0302.47036
Translations of Mathematical Monographs. Vol. 39. Providence, R.I.: American Mathematical Society (AMS). XI, 525 p. $ 48.50 (1975).

47E05 General theory of ordinary differential operators (should also be assigned at least one other classification number in Section 47-XX)
34L99 Ordinary differential operators
47A70 (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces
47A10 Spectrum, resolvent
35L05 Wave equation
47B25 Linear symmetric and selfadjoint operators (unbounded)
47-02 Research exposition (monographs, survey articles) pertaining to operator theory
34-02 Research exposition (monographs, survey articles) pertaining to ordinary differential equations