ZENG, Xiao Ming. Approximation for absolutely continuous functions by Stancu Beta operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 11, p. 1570–1576, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2827. Acesso em: 5 dec. 2025.