@article{TM_1975_134_a8,
     author = {N. P. Korneichuk},
     title = {Certain relations between the approximative characteristics of classes of periodic functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {115--123},
     publisher = {mathdoc},
     volume = {134},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_134_a8/}
}