[1]
S. A. Stasyuk, “Best $m$-term approximation of the classes $B ^{r}_{\infty, \theta}$ of functions of many variables by polynomials in the haar system”, Ukr. Mat. Zhurn., vol. 63, no. 4, pp. 549–555, Apr. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2740