Geodesic
A generalization of the characteristic problem for hyperbolic systems
Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 678-686 
M. P. Grigolia. A generalization of the characteristic problem for hyperbolic systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 678-686. http://geodesic.mathdoc.fr/item/DE_1985_21_4_a14/
@article{DE_1985_21_4_a14,
     author = {M. P. Grigolia},
     title = {A generalization of the characteristic problem for hyperbolic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {678--686},
     year = {1985},
     volume = {21},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_4_a14/}
}
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