Vagabov, A. I. On conditions for the multiple expandability of functions in the root elements of a pencil of ordinary differential operators. (English. Russian original) Zbl 1270.34196 Differ. Equ. 48, No. 8, 1051-1064 (2012); translation from Differ. Uravn. 48, No. 8, 1067-1079 (2012). Reviewer: Manfred Möller (Johannesburg) MSC: 34L10 34B07 34B09 34B27 PDF BibTeX XML Cite \textit{A. I. Vagabov}, Differ. Equ. 48, No. 8, 1051--1064 (2012; Zbl 1270.34196); translation from Differ. Uravn. 48, No. 8, 1067--1079 (2012) Full Text: DOI
Naĭmark, M. A. Linear differential operators. 3rd ed. (Линейные дифференциальные операторы.) (Russian) Zbl 1221.47085 Klassika i Sovremennost’. Moscow: Fizmatlit (ISBN 978-5-9221-1259-8). 528 p. (2010). MSC: 47E05 PDF BibTeX XML Cite \textit{M. A. Naĭmark}, Линейные дифференциальные операторы (Russian). 3rd ed. Moscow: Fizmatlit (2010; Zbl 1221.47085)
Locker, John Eigenvalues and completeness for regular and simply irregular two-point differential operators. (English) Zbl 1162.34001 Mem. Am. Math. Soc. 911, 177 p. (2008). Reviewer: Manfred Möller (Johannesburg) MSC: 34-02 34L10 34L20 47E05 34B05 PDF BibTeX XML Cite \textit{J. Locker}, Eigenvalues and completeness for regular and simply irregular two-point differential operators. Providence, RI: American Mathematical Society (AMS) (2008; Zbl 1162.34001) Full Text: DOI
Knowles, Ian On the boundary conditions characterizing J-sefladjoint extensions of J- symmetric operators. (English) Zbl 0483.34019 J. Differ. Equations 40, 193-216 (1981). MSC: 34L99 34B10 47B25 PDF BibTeX XML Cite \textit{I. Knowles}, J. Differ. Equations 40, 193--216 (1981; Zbl 0483.34019) Full Text: DOI
Naĭmark, M. A. Linear differential operators. (Линеĭные дифференциалъные операторы) (Lineare Differentialoperatoren.) (Russian) Zbl 0193.04101 Moskau: Verlag ’Nauka’, Hauptredaktion für physikalisch-mathematische Literatur. 528 p. (1969). Reviewer: Gerhard Maeß MSC: 34-02 47-02 34Lxx 47E05 PDF BibTeX XML
Naimark, M. A. Linear differential operators. Part II: Linear differential operators in Hilbert space. With additional material by the author. Translated by E. R. Dawson. English translation edited by W. N. Everitt. (English) Zbl 0227.34020 New York: Frederick Ungar Publishing Co. XV, 352 p. (1968). MSC: 34L99 34-01 34G10 PDF BibTeX XML