@article{DE_1987_23_1_a8,
     author = {G. D. Karatoprakliev},
     title = {Nonlocal boundary value problems for equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {78--84},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_1_a8/}
}