PACHPATTE, B. G. New Ostrowski type inequality for triple integrals. Tamkang Journal of Mathematics, [S. l.], v. 38, n. 3, p. 253–259, 2007. DOI: 10.5556/j.tkjm.38.2007.78. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/78. Acesso em: 5 jul. 2022.