Geodesic
The theorem of M. V. Keldysh on $n$-fold completeness, and the convergence of the solution of a Cauchy difference problem
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 3 
G. A. Voropaeva. The theorem of M. V. Keldysh on $n$-fold completeness, and the convergence of the solution of a Cauchy difference problem. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 3. http://geodesic.mathdoc.fr/item/RM_1970_25_3_a18/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] M. V. Keldysh, “O sobstvennykh znacheniyakh i sobstvennykh funktsiyakh nekotorykh klassov nesamosopryazhennykh uravnenii”, DAN, 179:1 (1951), 11–14

[2] S. K. Godunov, V. S. Ryabenkii, Vvedenie v teoriyu raznostnykh skhem, Fizmatgiz, M., 1962 | MR

[3] G. A. Voropaeva, V. P. Maslov, “Kratnaya polnota po M. V. Keldyshu i edinstvennost resheniya sootvetstvuyuschei zadachi Koshi”, Funkts. analiz, 4:2 (1970), 10–17 | MR | Zbl