@article{ZVMMF_1997_37_11_a2,
     author = {L. N. Bondarenko and P. Ph. Zhuk},
     title = {Accurate estimates for the speed of convergence of $s$-step iterative methods of variational type in a {Hilbert} space},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1301--1310},
     year = {1997},
     volume = {37},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1997_37_11_a2/}
}