VAKARCHUK, S. B.; SHVACHKO, A. V. On the Best Approximation in the Mean by Algebraic Polynomials with Weight and the Exact Values of Widths for the Classes of Functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 12, p. 1604–1621, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2540. Acesso em: 5 dec. 2025.