@article{DE_1987_23_1_a7,
     author = {N. Yu. Kapustin},
     title = {The {Tricomi} problem for a parabolic-hyperbolic equation with a degenerate hyperbolic side. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {72--78},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_1_a7/}
}