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A. S. Romanyuk, βOn Kolmogorov widths of classes $B^r_{p, \theta}$ of periodic functions of many variables with low smoothness in the space $L_q$β,
Ukr. Mat. Zhurn., vol. 46, no. 7, pp. 915β926, Jul. 1994, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/5683