Tan, M.H., S.H. Chong, T.F. Tang, A.Z. Shukor, V. Sakthivelu, T.C. Ma, and M.R. Md Nawawi. 2016. “Tracking Control of Vertical Pneumatic Artificial Muscle System Using PID”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 8 (7):129-32. https://jtec.utem.edu.my/jtec/article/view/1293.