Geodesic
M. V. Keldysh's multiple completeness and the uniqueness of the solution of the corresponding Cauchy problem
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 10-17 
G. A. Voropaeva; V. P. Maslov. M. V. Keldysh's multiple completeness and the uniqueness of the solution of the corresponding Cauchy problem. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 10-17. http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a1/
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     title = {M. {V.} {Keldysh's} multiple completeness and the uniqueness of the solution of the corresponding {Cauchy} problem},
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[1] Keldysh M.V., “O sobstvennykh znacheniyakh i sobstvennykh funktsiyakh nekotorykh klassov nesamosopryazhennykh uravnenii”, DAN SSSR, 77:1 (1951), 11–14 | Zbl

[2] Allakhverdiev D.E., O sobstvennykh znacheniyakh i sobstvennykh elementakh nesamosopryazhennykh operatorov, ratsionalno zavisyaschikh ot spektralnogo parametra, Doktorskaya dissertatsiya, M., 1968