@article{DE_1983_19_1_a15,
     author = {M. S. Salakhitdinov and A. Hasanov},
     title = {The {Tricomi} problem for an equation of mixed type with a nonsmooth line of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {110--119},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_1_a15/}
}