ROMANYUK, A. S. Estimation of the Entropy Numbers and Kolmogorov Widths for the Nikol’skii–Besov Classes of Periodic Functions of Many Variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 11, p. 1540–1556, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2088. Acesso em: 5 dec. 2025.