@article{MZM_1971_9_5_a2,
     author = {I. M. Kolodii and F. Hil'debrand},
     title = {Some properties of the modulus of continuity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {495--500},
     publisher = {mathdoc},
     volume = {9},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_5_a2/}
}