@article{DE_1984_20_4_a18,
     author = {M. R. Khan},
     title = {A nonlocal problem for the {Lavrent'ev{\textendash}Bitsadze} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {710--711},
     year = {1984},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_4_a18/}
}