@article{MZM_1979_25_2_a5,
     author = {I. A. Shevchuk},
     title = {Constructive characterization of classes of continuous functions on a set $\mathfrak M\subset C$ for the $k$-th modulus of continuity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {225--247},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_2_a5/}
}