Geodesic
On the spectrum of a differential operator of high-order
Matematičeskie zametki, Tome 77 (2005) no. 2, pp. 188-193
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In this paper, sufficient conditions for the spectrum of the operator of high order to be discrete and unbounded below are obtained. 
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M. G. Gimadislamov. On the spectrum of a differential operator of high-order. Matematičeskie zametki, Tome 77 (2005) no. 2, pp. 188-193. http://geodesic.mathdoc.fr/item/MZM_2005_77_2_a2/

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[2] Titchmarsh E. Ch., Razlozhenie po sobstvennym funktsiyam, svyazannoe s differentsialnymi uravneniyami vtorogo poryadka, Ch. 1, IL, M., 1960

[3] Ismagilov R. A., “O spektre uravneniya Shturma–Liuvillya s koleblyuschimsya potentsialom”, Matem. zametki, 37:6 (1985), 869–879 | Zbl