Chai Mau Shern, Rozaimi Ghazali, Chong Shin Horng, Chong Chee Soon, and Hazriq Izzuan Jaafar, “Optimization Techniques in PID Controller on a Nonlinear Electro-Hydraulic Actuator ystem”, J. Adv. Res. Fluid Mech. Therm. Sc., vol. 56, no. 2, pp. 296–303, Mar. 2024.