@article{DE_1987_23_7_a17,
     author = {M. P. Sapagovas and R. J. \v{C}iegis},
     title = {On some boundary value problems with a nonlocal condition},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1268--1274},
     publisher = {mathdoc},
     volume = {23},
     number = {7},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_7_a17/}
}