Anang, N.A., L. Abdullah, Z. Jamaludin, T.H. Chiew, M. Maharof, S.N.S Salim, Z. Retas, and S.C.K. Junoh. 2017. “Tracking Performance of NPID Controller for Cutting Force Disturbance of Ball Screw Drive”. Journal of Mechanical Engineering and Sciences 11 (4):3227-39. https://doi.org/10.15282/jmes.11.4.2017.25.0291.