PEČARIĆ, J. E.; PERUŠIĆ, A.; SMOLJAK, K. Generalizations of Steffensen’s Inequality by Lidstone’s Polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 11, p. 1525–1539, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2087. Acesso em: 5 dec. 2025.