RomanyukA. S. (2001) “Linear Widths of the Besov Classes of Periodic Functions of Many Variables. II”, Ukrains’kyi Matematychnyi Zhurnal, 53(6), pp. 820-829. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4302 (Accessed: 22November2024).