KONOVALOV , V. N. Approximation of functions from the Sobolev space by algebraic polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 5, p. 613–617, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7956. Acesso em: 6 dec. 2025.