1. Berger, C.S., “Robust controller design by minimisation of the variation of the coefficients of the closed loop characteristic equation”. Proc. IEEE Pt. D., 131, pp 103–107, May 1984.
2. Berger, C.S. and Brown, W.A., “Adaptive control of muscle relaxation”, IFAC Symposium on real time digital control applications Mexico, 1983.
3. “New Algorithm for minimal solution of linear polynomial equations”;Jezek;Kybernetika,1980
4. “Pole assignment self-tuning regulator”;Wellstead;Proc. IEE,1979