STASYUK, S. A. Best $M$-Term Trigonometric Approximations of the Classes $B_{p,θ}^Ω$ of Functions of Many Variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 3, p. 381–394, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4074. Acesso em: 5 dec. 2025.