SHCHEHLOV, M. V. Pointwise estimation of sign-preserving polynomial approximation on arcs in the complex plane. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 4, p. 560–568, 2022. DOI: 10.37863/umzh.v74i4.7057. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7057. Acesso em: 8 dec. 2025.