V. S. Romanyuk, “Kolmogorov widths and entropy numbers in the Orlich spaces with the Luxembourg norm”, Ukr. Mat. Zhurn., vol. 69, no. 5, pp. 682–694, May 2017, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1727