1. Golob, M., Tovornik, B., Donlagic, D.: Comparison of the self-tuning on-off controller with the conventional switching controllers. In: Proceedings 1992 The First IEEE Conference on Control Applications, Dayton, OH, 1992, pp. 962–963 (1992)
2. Chai, T., Joe Qin, S., Wang, H.: Optimal operational control for complex industrial processes. Ann. Rev. Control 38(1), 81–92 (2014)
3. Li, Y., Ang, K.H., Chong, G.C.: Patents, software, and hardware for PID control: an overview and analysis of the current art. IEEE Control Syst. Mag. 26(1) 42–54 (2006)
4. Ziegler, J.G., Nichols, N.B.: Optimum settings for automatic controllers. Trans. ASME 64(11), 759–768 (1942)
5. Meshram, P.M., Kanojiya, R.G.: Tuning of PID controller using Ziegler-Nichols method for speed control of DC motor. In: IEEE-International Conference on Advances in Engineering, Science and Management, pp. 117–122 (2012)