Thuý, Đặng, Cao Tinh, Lê Hiếu, and Lê Vân. “New Sufficient Criteria for Epsilon-Contraction of a Class of Nonlinear Diference System With Continuous Time”. Science & Technology Development Journal: Natural Sciences 3, no. 3 (February 13, 2020): 213-224. Accessed April 20, 2024. http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/649.