@article{DAN_1993_332_4_a6,
     author = {G. I. Shishkin},
     title = {Grid approximation of the {Dirichlet} problem for a singularly},
     journal = {Doklady Akademii Nauk},
     pages = {424--427},
     publisher = {mathdoc},
     volume = {332},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_332_4_a6/}
}