@article{DE_1987_23_1_a1,
     author = {Sh. A. Alimov},
     title = {On smoothness of the solution of a degenerate problem with a directional derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {10--22},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_1_a1/}
}