Krall, Allan M. On the expansion problem for non-self-adjoint ordinary differential operators of second order. (English) Zbl 0148.33801 Duke Math. J. 34, 163-174 (1967). Reviewer: J. B. McLeod Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 34-XX Ordinary differential equations 47E05 General theory of ordinary differential operators Keywords:ordinary differential equations × Cite Format Result Cite Review PDF Full Text: DOI