@article{DE_1984_20_7_a18,
     author = {M. P. Sapagovas},
     title = {Numerical methods for a two-dimensional problem with a nonlocal condition},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1258--1266},
     year = {1984},
     volume = {20},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_7_a18/}
}