@article{ZVMMF_1994_34_4_a17,
     author = {S. A. Shishkin},
     title = {Singular filtering of matrix and grid operators. {Error} estimates},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {636--639},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1994_34_4_a17/}
}