@article{MZM_1992_51_4_a17,
     author = {A. S. Belov},
     title = {Order estimates for best approximations and moduli of continuity of the sum of a trigonometric series with {Quasi-monotone} coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {132--134},
     publisher = {mathdoc},
     volume = {51},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_4_a17/}
}