@article{DE_1986_22_1_a6,
     author = {M. M. Zainulabidov},
     title = {The {Bitsadze{\textendash}Samarskiǐ} problem for equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {54--59},
     year = {1986},
     volume = {22},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_1_a6/}
}