KASJANOV, V. Generalization of gronwall-bellman and beekhary lemmas. Proceedings of National Aviation University (archive), [S. l.], v. 9, n. 2, p. 166–173, 2001. DOI: 10.18372/2306-1472.9.12041. Disponível em: http://jrnl.kai.edu.ua/index.php/visnik/article/view/12041. Acesso em: 14 jun. 2026.