Dinh Phu, N. and Thanh Long, H. 2001. THE EXPANSIONS AND APPLICATIONS OF GRONWALL – BELLMAN’S LEMMA. Science and Technology Development Journal. 4, 8&9 (Sep. 2001), 48-59. DOI:https://doi.org/https://doi.org/10.32508/stdj.v4i8&9.3514.