PACHPATTE, S. B. .; PACHPATTE, B. G. Inequalities for terminal value problems for differential equations. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 3, p. 199-208, 2002. DOI: 10.5556/j.tkjm.33.2002.322. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/322. Acesso em: 23 may. 2022.