@article{DE_1991_27_1_a8,
     author = {M. G. Karatopraklieva},
     title = {A nonlocal boundary value problem for an equation of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {68--79},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_1_a8/}
}