Geodesic
On nonisolated singular points of the spectrum of elliptic operators
Izvestiya. Mathematics , Tome 10 (1976) no. 2, pp. 393-411.

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The density of the positive point spectrum and the asymptotic behavior of the eigenfunctions of a perturbed polyharmonic operator are studied. A condition for the finiteness of the point spectrum is obtained in terms of the coefficients. Bibliography: 21 titles. 
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Kh. Kh. Murtazin. On nonisolated singular points of the spectrum of elliptic operators. Izvestiya. Mathematics , Tome 10 (1976) no. 2, pp. 393-411. http://geodesic.mathdoc.fr/item/IM2_1976_10_2_a9/

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