@article{DE_1977_13_1_a8,
     author = {V. A. Eleev},
     title = {An analogue of the {Tricomi} problem for mixed parabolic-hyperbolic equations with a noncharacteristic line of change of type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {56--63},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a8/}
}