@article{DE_1977_13_1_a18,
     author = {M. S. Salakhitdinov and B. Mengziyaev},
     title = {A certain boundary value problem with shift for a mixed type equation with two lines of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {133--139},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a18/}
}