Konovalov, V.N. (2004) “Shape-preserving kolmogorov widths of classes of s-monotone integrable functions”, Ukrains’kyi Matematychnyi Zhurnal, 56(7), pp. 901–926. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3808 (Accessed: 5 December 2025).