Bhuvanendhiran, T., and S. Abraham Lincon. “Performance Evaluation of Nonlinear PI Controller on the Laboratory Type Spherical Tank Process”. Asian Journal of Electrical Sciences 8, no. 2 (April 16, 2019): 16–20. Accessed May 3, 2024. https://ojs.trp.org.in/index.php/ajes/article/view/2364.