@article{MZM_1987_41_4_a8,
     author = {A. P. Petukhov},
     title = {Estimates of the derivatives of trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {517--520},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_4_a8/}
}