ACU, A.-M.; GONSKA, H.; RA¸SA, I. Grüss-type and Ostrowski-type inequalities in approximation theory. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 6, p. 723–740, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2758. Acesso em: 5 dec. 2025.