Geodesic
Solvability of a characteristic problem for second-order degenerate hyperbolic systems
Differencialʹnye uravneniâ, Tome 25 (1989) no. 1, pp. 154-162 
S. S. Kharibegashvili. Solvability of a characteristic problem for second-order degenerate hyperbolic systems. Differencialʹnye uravneniâ, Tome 25 (1989) no. 1, pp. 154-162. http://geodesic.mathdoc.fr/item/DE_1989_25_1_a17/
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     author = {S. S. Kharibegashvili},
     title = {Solvability of a characteristic problem for second-order degenerate hyperbolic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {154--162},
     year = {1989},
     volume = {25},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a17/}
}
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