Olutimo, A. L. “Stability And Ultimate Boundedness Of Solutions Of A Certain Third Order Nonlinear Vector Differential Equation”. Journal of the Nigerian Mathematical Society 31, no. 1-3 (April 12, 2021): 69–80. Accessed April 19, 2024. https://ojs.ictp.it/jnms/index.php/jnms/article/view/750.