D. A. S. Sadiq, S. H. Saeed, and W. A. Muneer, “Design and simulation of a PI controller system with frequency response”, SJUOZ, vol. 4, no. 2, pp. 269–274, Dec. 2016, Accessed: Jan. 22, 2026. [Online]. Available: https://www.stest.uoz.edu.krd/index.php/sjuoz/article/view/360