@article{ZVMMF_1979_19_2_a1,
     author = {A. M. Fedotov},
     title = {Some inequalities for the errors of approximate solutions of operator equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {277--291},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_2_a1/}
}