Shamseldin, M.A., Sallam, M., Bassiuny, A.M. and Abdel Ghany, A.M. 2018. Real-time implementation of an enhanced nonlinear PID controller based on harmony search for one-stage servomechanism system. Journal of Mechanical Engineering and Sciences. 12, 4 (Dec. 2018), 4161–4179. DOI:https://doi.org/10.15282/jmes.12.4.2018.13.0359.