Geodesic
The investigation of the differential operator's point spectrum in infinity with precise behavior coefficients
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2003), pp. 8-15.

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In $L^2(\mathbb {R})$ space an $m\geq 2$, linear order self-adjoint differential operator is observed, the coefficients of which have precise behavior in infinity. The operator’s point spectrum is examined. Particularly the limitation of point spectrum and the non-infinity of boundary points set are proved.
Keywords: Self-adjoint differential operator, point spectrum, boundary points set. 
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A. G. Petrosyan. The investigation of the differential operator's point  spectrum in infinity with precise behavior coefficients. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2003), pp. 8-15. http://geodesic.mathdoc.fr/item/UZERU_2003_3_a1/

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