@article{DE_1981_17_1_a18,
     author = {S. S. Kharibegashvili},
     title = {A problem of {Goursat} type for a class of hyperbolic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {157--164},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_1_a18/}
}