@article{DE_1998_34_1_a16,
     author = {O. A. Repin},
     title = {On the solvability of a problem with a boundary condition on the characteristics for a degenerate hyperbolic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {110--113},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_1_a16/}
}