@article{MZM_1968_4_2_a14,
     author = {L. V. Taikov},
     title = {Kolmogorov-type inequalities and the best formulas for numerical differentiation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {233--238},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a14/}
}