KASJANOV, V. Generalization of gronwall-bellman and beekhary lemmas. Proceedings of National Aviation University, [S. l.], v. 9, n. 2, p. 166–173, 2001. DOI: 10.18372/2306-1472.9.12041. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/12041. Acesso em: 4 may. 2024.