Geodesic
On localization of the spectrum of the problem with complex weight
Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 49-64.

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In the paper, we consider problems with complex weight whose spectrum does not satisfy the classical asymptotic formula. 
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Kh. K. Ishkin. On localization of the spectrum of the problem with complex weight. Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 49-64. http://geodesic.mathdoc.fr/item/FPM_2006_12_5_a4/

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