Geodesic
An upper bound for the existence time of the smooth solution of a quasi-linear hyperbolic system
Doklady Akademii Nauk, Tome 201 (1971) no. 1, pp. 12-15 
V. A. Borovikov. An upper bound for the existence time of the smooth solution of a quasi-linear hyperbolic system. Doklady Akademii Nauk, Tome 201 (1971) no. 1, pp. 12-15. http://geodesic.mathdoc.fr/item/DAN_1971_201_1_a1/
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     author = {V. A. Borovikov},
     title = {An upper bound for the existence time of the smooth solution of a quasi-linear hyperbolic system},
     journal = {Doklady Akademii Nauk},
     pages = {12--15},
     year = {1971},
     volume = {201},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_1_a1/}
}
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