[1]
Leviatan D., MotornaO.V. and ShevchukI.A. 2022. No Jackson-type estimates for piecewise $q$-monotone, $q\ge3$, trigonometric approximation. Ukrains’kyi Matematychnyi Zhurnal. 74, 5 (Jun. 2022), 662 - 675. DOI:https://doi.org/10.37863/umzh.v74i5.7081.