1. Survey of the philosophy and state of the art of adaptive systems;COOPER,1960
2. A survey of adaptive control systems;ASELTINE;IRE Trans. Autom. Control,1958
3. A general theory of nonlinear estimation problem in control systems;BALAKRISHNAN;J. Math. Anal. Appl.,1964
4. An operator theoretic formulation of a class of control problems and a steepest descent method of solution;BALAKRISHNAN;J. SIAM Control,1963
5. A. V. BALAKRISHNAN and H. C. HSIEH, Function space methods in control system optimization. Proc. Optimum System Syn. Conf. (1963). ASD-TDR 63–119. Wright-Patterson Air Force Base, Ohio