Gronwall-Bellman and Pachpatte type double integral inequalities with applications. Punjab University Journal of Mathematics, [S. l.], v. 55, n. 7, p. 291–311, 2023. Disponível em: https://pujm.pu.edu.pk/index.php/pujm/article/view/187. Acesso em: 29 jun. 2025.