1. Åström, KJ, Hägglund, T. The future of PID control. Contr Eng Pract 2001;9:1163–75. https://doi.org/10.1016/s0967-0661(01)00062-4.
2. Palmor, ZJ. The control handbook, chap. Time delay compensation: Smith predictor and its modifications. USA: CRC Press and IEEE Press; 1996.
3. Åström, KJ, Hägglund, T, Astrom, KJ. Advanced PID control. Research Triangle Park: ISA-The Instrumentation, Systems, and Automation Society; 2006.
4. Smith, OJ. Closer control of loops with dead time. Chem Eng Progr 1957;53:217–9.
5. Smith, OJM. A controller to overcome dead time. ISA J 1959;6:28–33.