1. The stability of a nonlinear time-varying system
2. EVELEIGH , V. W. , 1967 ,Adaptive Control and Optimization Techniques( McGraw-Hill Book Company ), p. 277 .
3. LEONDES , C. T. , 1965 ,Modern Control Systems Theory( McGraw-Hill Book Company ), p. 228 .
4. MEHBOTRA , R. , 1971 , M.E. Dissertation , Roorkee University .
5. Liapunov redesign of model reference adaptive control systems