H. Shather, A. (2020) “Backstepping Method for Stabilizing System of 2×2 Riccati Matrix Differential Equations”, Al-Nahrain Journal of Science, 23(2), pp. 52–59. Available at: https://mail.anjs.edu.iq/index.php/anjs/article/view/2278 (Accessed: 22 May 2026).