1. A new dimension: a self-tuning controller that continually optimizes PID constants;Andreiev;Control Eng.,1981
2. Survey of LQG based adaptive controllers;Astrom,1983
3. Direct methods for self-tuning PID regulators;Banyasz,1982
4. A self-tuning controller with a PID structure;Cameron;Int. J. Control,1983
5. Self-tuning controller;Clarke,1975