@article{MZM_1967_2_6_a0,
     author = {N. P. Korneichuk},
     title = {Precise estimates for the norms of differentiable periodic functions in the $L$ metric},
     journal = {Matemati\v{c}eskie zametki},
     pages = {569--576},
     year = {1967},
     volume = {2},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_2_6_a0/}
}