@article{DAN_1991_320_5_a2,
     author = {A. Dzhuraev},
     title = {On a degenerate boundary value problem in $3$-dimensional space},
     journal = {Doklady Akademii Nauk},
     pages = {1043--1048},
     publisher = {mathdoc},
     volume = {320},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_5_a2/}
}