Siva Kumar, Mangipudi, D. Rao, and Manyala Ramalinga Raju. “Design of Robust Stabilizing PI/PID Controller for Time Delay Interval Process Plants Using Particle Swarm Optimization”. Advances in Systems Science and Applications 18, no. 4 (December 28, 2018): 92-120. Accessed March 21, 2019. https://ijassa.ipu.ru/index.php/ijassa/article/view/536.