Geodesic
On the existence of a resolvent and separability for a class of singular hyperbolic type differential operators on an unbounded domain
Eurasian mathematical journal, Tome 7 (2016) no. 1, pp. 50-67.

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In the present work the existence of a resolvent and separability for a class of hyperbolic type operators with increasing coefficients in an unbounded domain are proved. 
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M. Muratbekov; M. Otelbaev. On the existence of a resolvent and separability for a class of singular hyperbolic type differential operators on an unbounded domain. Eurasian mathematical journal, Tome 7 (2016) no. 1, pp. 50-67. http://geodesic.mathdoc.fr/item/EMJ_2016_7_1_a3/

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