@article{DE_1984_20_2_a17,
     author = {K. B. Sabitov},
     title = {A problem of {Tricomi} type for equations of mixed type with strong characteristic degeneration},
     journal = {Differencialʹnye uravneni\^a},
     pages = {333--337},
     year = {1984},
     volume = {20},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_2_a17/}
}