Geodesic
A characterization problem for a class of second-order hyperbolic systems with a characteristic line of degeneration
Differencialʹnye uravneniâ, Tome 26 (1990) no. 2, pp. 305-313.

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     author = {S. S. Kharibegashvili},
     title = {A characterization problem for a class of second-order hyperbolic systems with a characteristic line of degeneration},
     journal = {Differencialʹnye uravneni\^a},
     pages = {305--313},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_2_a15/}
}
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S. S. Kharibegashvili. A characterization problem for a class of second-order hyperbolic systems with a characteristic line of degeneration. Differencialʹnye uravneniâ, Tome 26 (1990) no. 2, pp. 305-313. http://geodesic.mathdoc.fr/item/DE_1990_26_2_a15/