@article{DE_1990_26_7_a20,
     author = {F. A. Tagiev and A. M. Guseinov},
     title = {On the numerical solution of a {Tricomi-type} problem for equations with two lines of degeneracy with continuous coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1275--1277},
     publisher = {mathdoc},
     volume = {26},
     number = {7},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_7_a20/}
}