1. The feedforward, feedback and robust control of a general servomechanism problem-part I, II;Davison,1973
2. Robust control of a general servomechanism problem: the servocompensator;Davison;Automatica,1975
3. Synthesis of multivariable regulators: the internal model principle;Francis,1974
4. Robust solution of the linear servomechanism problem;Staats,1975
5. Multivariable tuning regulators: the feedforward and robust control of a general servomechanism problem;Davison;IEEE Trans, on Automatic Control,1976