Janin, Zuriati, Hazilah Mad Kaidi, Robiah Ahmad, and Sheroz Khan. “Derivative Proportional – Integral Controller Using Nelder-Mead Optimization for Glycerine Purification Heating Process”. International Journal of Integrated Engineering 12, no. 6 (July 19, 2020): 200–206. Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/6605.