@article{DE_1977_13_1_a1,
     author = {Kh. G. Bzhikhatlov},
     title = {A certain boundary value problem for mixed parabolic-hyperbolic equations with a characteristic line of change of type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {10--16},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a1/}
}