KOPOTUN, K. A.; LEVIATAN, D.; SHEVCHUK, I. A. Are the degrees of the best (co)convex and unconstrained polynomial approximations the same? II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 3, p. 369–386, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2873. Acesso em: 5 dec. 2025.