@article{DAN_1991_316_5_a5,
     author = {M. S. Salakhitdinov and B. Islomov},
     title = {Boundary value problems for an equation of mixed type with two},
     journal = {Doklady Akademii Nauk},
     pages = {1051--1054},
     publisher = {mathdoc},
     volume = {316},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_5_a5/}
}