1. Automatic tuning of PID controllers;Åström,1988
2. Computer Controlled Systems;Åström,1984
3. Expert control;Åström;Automatica,1986
4. Bristol, E.H. and P.D. Hansen (1987). Moment projection feedforward control adaptation. American Control Conference, Minneapolis, Minnesota.
5. Automatic tuning of PID regulators;Clarke,1986