@article{ZVMMF_2002_42_12_a2,
     author = {S. I. Repin and M. E. Frolov},
     title = {A posteriori error estimates for approximate solutions to boundary problem of elliptic equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1774--1787},
     publisher = {mathdoc},
     volume = {42},
     number = {12},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2002_42_12_a2/}
}