Konovalov, V. N. (2001) “Orders of Trigonometric and Kolmogorov Widths May Differ in Power Scale”, Ukrains’kyi Matematychnyi Zhurnal, 53(11), pp. 1575 -1579. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4378 (Accessed: 19May2024).