@article{MZM_1987_42_6_a3,
     author = {A. Yu. Shadrin},
     title = {Jackson-type theorems for monotone approximation of functions by trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {790--809},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_6_a3/}
}