Geodesic
Asymptotic behavior of the spectrum of an operator differential equation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4 
K. Kh. Boimatov. Asymptotic behavior of the spectrum of an operator differential equation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4. http://geodesic.mathdoc.fr/item/RM_1973_28_4_a10/
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     title = {Asymptotic behavior of the spectrum of an operator differential equation},
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[1] B. I. Korenblyum, “Obschaya tauberova teorema dlya otnoshenii funktsii”, DAN, 88:5 (1953), 745–748 | MR

[2] M. G. Gasymov, “O raspredelenii sobstvennykh znachenii samosopryazhennykh obyknovennykh differentsialnykh operatorov”, DAN, 184:4 (1969), 753–756 | MR

[3] A. G. Kostyuchenko, B. M. Levitan, “Ob asimptoticheskom povedenii sobstvennykh znachenii operatornoi zadachi Shturma - Liuvillya”, Funkts. analiz, 1:1 (1967), 86–96 | MR | Zbl

[4] M. Bairamogly, “Asimptotika chisla sobstvennykh znachenii obyknovennogo differentsialnogo operatora s operatornymi koeffitsientami”, Funkts. analiz i ego primeneniya, Baku, 1971, 144–166 | MR | Zbl