VAKARCHUK, S. B. On the best approximation in the mean and overconvergence of a sequence of polynomials of the best approximation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 1, p. 35–45, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4394. Acesso em: 5 dec. 2025.