@article{MZM_1976_20_5_a3,
     author = {N. P. Korneichuk},
     title = {Best approximation by splines on classes of periodic functions in the metric of $L$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {655--664},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_5_a3/}
}