Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
A. Yu. Shadrin. Jackson-type theorems for monotone approximation of functions by trigonometric polynomials. Matematičeskie zametki, Tome 42 (1987) no. 6, pp. 790-809. http://geodesic.mathdoc.fr/item/MZM_1987_42_6_a3/