@article{DAN_1979_249_1_a6,
     author = {A. A. Katrahova},
     title = {On approximation of solutions of some singular elliptic boundary value problems},
     journal = {Doklady Akademii Nauk},
     pages = {34--37},
     year = {1979},
     volume = {249},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_1_a6/}
}