@article{DE_1978_14_1_a5,
     author = {S. K. Kumykova and Ph. B. Nakhusheva},
     title = {A boundary value problem for a hyperbolic equation that degenerates inside the domain},
     journal = {Differencialʹnye uravneni\^a},
     pages = {50--65},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_1_a5/}
}