StasyukS. A. (2016) “Best $m$-term trigonometric approximation for periodic functions with low mixed smoothness from the Nikol’skii – Besov-type classes”, Ukrains’kyi Matematychnyi Zhurnal, 68(7), pp. 983-1003. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1896 (Accessed: 24November2024).