DRAGOMIR, S.S. Refinements of the generalized trapezoid inequality in terms of the cumulative variation and applications. CUBO, A Mathematical Journal, [S. l.], v. 17, n. 2, p. 31–48, 2015. DOI: 10.4067/S0719-06462015000200003. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1175. Acesso em: 9 jan. 2026.