Madhubala.V, Hemavathy.G, and Gayathri.M. “PID Parameters Optimization for Spherical Tank Process”. International Journal of Advance Research in Engineering, Science & Technology 2, no. 2 (February 25, 2015): 27–29. Accessed March 20, 2026. https://ijarest.org/index.php/ijarest/article/view/13.