BARNETT, N. S.; DRAGOMIR, S. S. On the perturbed trapezoid formula. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 2, p. 119-128, 2002. DOI: 10.5556/j.tkjm.33.2002.291. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/291. Acesso em: 19 sep. 2021.