@article{DE_1972_8_1_a14,
     author = {M. S. Salakhitdinov and A. Tolipov},
     title = {Certain boundary value problems for equations of mixed type with one and two curves of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {134--142},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_1_a14/}
}