@article{ZVMMF_1971_11_4_a16,
     author = {N. S. Bakhvalov},
     title = {On the optimality of linear methods for operator approximation in convex classes of functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1014--1018},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1971_11_4_a16/}
}