@article{DE_1981_17_1_a7,
     author = {T. D. Dzhuraev and A. Sopuev},
     title = {A three-dimensional problem for an equation of mixed parabolic-hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {50--57},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_1_a7/}
}