MOTORNYI, V. P. On Exact Estimates for the Pointwise Approximation of the Classes $W^rH^ω$ by Algebraic Polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 6, p. 783–799, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4299. Acesso em: 6 dec. 2025.