@article{MZM_1977_22_4_a8,
     author = {L. V. Taikov},
     title = {Best approximations of differentiable functions in the metric of the space~$L_2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {535--542},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_4_a8/}
}