@article{DE_1986_22_1_a17,
     author = {S. S. Kharibegashvili},
     title = {Characteristic problem for a class of second-order hyperbolic systems with parabolic degeneration},
     journal = {Differencialʹnye uravneni\^a},
     pages = {153--164},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_1_a17/}
}