@article{DE_1985_21_1_a7,
     author = {M. M. Zainulabidov},
     title = {The two-dimensional {Tricomi} problem when the domain of parabolicity is two-dimensional},
     journal = {Differencialʹnye uravneni\^a},
     pages = {51--58},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_1_a7/}
}