Geodesic
Second order linear degenerate hyperbolic equations with an infinite dependence domain
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 4 
A. S. Kalashnikov. Second order linear degenerate hyperbolic equations with an infinite dependence domain. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 4. http://geodesic.mathdoc.fr/item/RM_1971_26_4_a9/
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     author = {A. S. Kalashnikov},
     title = {Second order linear degenerate hyperbolic equations with an infinite dependence domain},
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     year = {1971},
     volume = {26},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_4_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] M. M. Smirnov, Vyrozhdayuschiesya ellipticheskie i giperbolicheskie uravneniya, «Nauka», M., 1966 | MR

[2] A. S. Kalashnikov, “Zadacha bez nachalnykh uslovii v klassakh rastuschikh funktsii dlya nekotorykh lineinykh vyrozhdayuschikhsya parabolicheskikh sistem vtorogo poryadka. I; II”, Vestn. MGU, ser. matem. i mekh., 1971, no. 2, 29–35