Anang, N.A., L. Abdullah, Z. Jamaludin, T.H. Chiew, M. Maharof, S.N. Syed Salim, and Z. Retas. 2018. “Analysis of Nonlinear PID Controller for Tracking Performance of Ball Screw Drive”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 10 (2-2):67-71. https://jtec.utem.edu.my/jtec/article/view/3964.