@article{MZM_2018_103_2_a13,
     author = {N. V. Omel'chenko},
     title = {On the $K${-Functional} for the {Mixed} {Generalized} {Modulus} of {Smoothness}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {312--315},
     publisher = {mathdoc},
     volume = {103},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_103_2_a13/}
}