@article{DAN_1979_245_4_a9,
     author = {G. I. Shishkin},
     title = {The numerical solution of elliptic equations with a small parameter at the leading derivatives},
     journal = {Doklady Akademii Nauk},
     pages = {804--808},
     publisher = {mathdoc},
     volume = {245},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_245_4_a9/}
}