SmazhenkoI. V. (2005) “Weighted Moduli of Smoothness and Sign-Preserving Approximation”, Ukrains’kyi Matematychnyi Zhurnal, 57(3), pp. 400–420. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3608 (Accessed: 22November2024).