DZYUBENKO, H. A. Pointwise estimation of an almost copositive approximation of continuous functions by algebraic polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 5, p. 641–649, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1723. Acesso em: 7 apr. 2025.