@article{DE_1983_19_1_a18,
     author = {S. S. Kharibegashvili},
     title = {Solvability of a problem of {Goursat} type for second-order normally hyperbolic systems with variable coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {134--145},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_1_a18/}
}