Geodesic
Propagation of perturbations from a point source described by a quasihyperbolic equation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 5 
A. A. Lokshin. Propagation of perturbations from a point source described by a quasihyperbolic equation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 5. http://geodesic.mathdoc.fr/item/RM_1976_31_5_a27/
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     title = {Propagation of perturbations from a~point source described by a~quasihyperbolic equation},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] S. A. Galpern, “Fundamentalnye resheniya i lakuny kvazigiperbolicheskikh uravnenii”, UMN, 29:2 (176) (1974) | MR

[2] A. A. Lokshin, “O kvazigiperbolicheskikh uravneniyakh”, Trudy seminara imeni I. G. Petrovskogo, 1 (1975) | Zbl

[3] S. Leng, Algebra, Mir, M., 1967