KONSEVICH, N. M. Best Orthogonal Trigonometric Approximations of Classes of Functions of Many Variables $L^{ψ}_{β, p}$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 1, p. 23–29, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4217. Acesso em: 5 dec. 2025.