@article{DAN_1991_318_5_a9,
     author = {I. Kurbanov},
     title = {Solvability of nonlinear boundary value problems of},
     journal = {Doklady Akademii Nauk},
     pages = {1068--1071},
     publisher = {mathdoc},
     volume = {318},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_5_a9/}
}