1. A method for computing least squares estimates that keep up with the data;Albert;SIAM J. Control,1966
2. Theory and application of self-tuning regulators;Åström;Automatica,1977
3. On self-tuning regulators;Åström;Automatica,1973
4. Self-tuning controllers based on pole zero placement;Åström,1980
5. Factorization Methods for Discrete Sequential Estimation;Bierman,1977