1. A new dimension: a self-tuning controller that continually optimizes PID constants;Andreiev;Control Eng,1981
2. Design principles for self-tuning regulators;Åström,1981
3. Theory and applications of adaptive control;Åström,1981
4. Theory and applications of self-tuning regulators;Åström;Automatica,1977
5. On self-tuning regulators;Åström;Automatica,1973