V. N. Konovalov, “Shape-preserving kolmogorov widths of classes of s-monotone integrable functions”, Ukr. Mat. Zhurn., vol. 56, no. 7, pp. 901–926, Jul. 2004, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3808