@article{DE_1991_27_6_a12,
     author = {B. Islomov},
     title = {Analogues of the {Tricomi} problem for an equation of mixed parabolic-hyperbolic type with two lines and different order of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1007--1014},
     publisher = {mathdoc},
     volume = {27},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_6_a12/}
}