PACHPATTE, B. G. New inequalities of Ostrowski and Gruss type for triple integrals. Tamkang Journal of Mathematics, [S. l.], v. 40, n. 2, p. 117–127, 2009. DOI: 10.5556/j.tkjm.40.2009.461. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/461. Acesso em: 18 jul. 2024.