1. Whitaker, H.P. Proc.of the Self Adaptive Flight Control Systems symposium, WADC TR 59-49 March, 1959.
2. Osburn, P.V., Whitaker, H.P. and Keezer, A. New developments in the design of adaptive control systems. IAS Paper No.61-39.
3. Donalson, D.D. and Leondes, C.T. A model referenced Parameter Tracking technique for Adaptive Control Systems. IEEE Trans, on Applications and Industry. Sept.63, pp. 241-262.
4. La Salle, J.P. and Rath, R.J. A new concept of stability. Paper 415 RIAS. Aug. 1962.
5. Grayson, L.P. The design of nonlinear and adaptive systems via Liapunov’s second method. Polytechnic Institute of Brooklyn Report PIB MR1-937-61.