@article{DAN_1965_160_4_a4,
     author = {V. V. Zhuk},
     title = {A modification of the concept of modulus of smoothness and its application to the estimation of {Fourier} coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {758--761},
     publisher = {mathdoc},
     volume = {160},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_160_4_a4/}
}