@article{MZM_1979_26_3_a4,
     author = {A. A. Zhensykbaev},
     title = {Spline interpolation and best approximation by trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {355--366},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_26_3_a4/}
}