MOTORNAYA, O. V.; MOTORNYI, V. P.; NITIEMA, P. K. One-sided approximation of a step by algebraic polynomials in the mean. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 3, p. 409–422, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2876. Acesso em: 5 dec. 2025.