GONSKA, H.; PĂLTĂNEA, R. Quantitative convergence theorems for a class of Bernstein–Durrmeyer operators preserving linear functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 7, p. 913–922, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2924. Acesso em: 27 apr. 2025.