@article{MZM_2016_100_3_a8,
     author = {K. V. Runovskii and N. V. Omel'chenko},
     title = {Mixed {Generalized} {Modulus} of {Smoothness} and {Approximation} by the {{\textquotedblleft}Angle{\textquotedblright}} of {Trigonometric} {Polynomials}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {421--432},
     year = {2016},
     volume = {100},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_3_a8/}
}