Romanyuk, A. S. and Romanyuk, V. S. (2019) “Estimates of some approximating characteristics of the classes of periodic functions of one and many variables”, Ukrains’kyi Matematychnyi Zhurnal, 71(8), pp. 1102-1115. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1501 (Accessed: 20April2024).