@article{DE_1982_18_1_a17,
     author = {S. S. Kharibegashvili},
     title = {On a {Goursat-type} problem for a class of systems of second-order equations of hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {152--166},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_1_a17/}
}