@article{MZM_2016_100_3_a0,
     author = {P. A. Andrianov and O. L. Vinogradov},
     title = {On the {Constant} and {Step} in {Jackson's} {Inequality} for {Best} {Approximations} by {Trigonometric} {Polynomials} and by {Haar} {Polynomials}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {323--330},
     publisher = {mathdoc},
     volume = {100},
     number = {3},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_3_a0/}
}