N. A. Al-awad, “Model Reduction of Continuous Systems by Modified Routh Array and Pade Approximation Technique”, J. eng. sustain. dev., vol. 14, no. 2, pp. 198–211, Jun. 2010, Accessed: Apr. 19, 2025. [Online]. Available: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1474