1[1]M. Jankovic, R. Sepulchre and P. V. Kokotovic, Constructive Lyapunov stabilization of nonlinear cascade systems. IEEE Trans. Auto. Contr. , AC-41(1996) 1723- 1735.
2[2]F. Mazenc and L. Praly, Adding integrations, saturated controis, and stabilization for feedforward-ing systems. IEEE Trans. Auto. Contr. , AC- 41 (1996) 1559- 1578.
3[3]W. Su and M. Fu, Robust nonlinear forwarding with smooth state feedback control. Proceedings of IFAC' 99 World Congress, F (1999) 435 - 440.
4[4]W. Su and M. Fu. Some new result Robust nonlinear forwarding. Proceedings of 5th IFAC Symposium Nonlinear Control Systems, (St. Petersburg 2001) 789-794. 23.
5[5]W. Su and M. Fu, "Robust nonlinear control: beyond backstepping and nonlinear forwarding, " proceedings of IEEE Conference on Decision and Control, Phonenix, Arizona, pp. 831- 837,1999.
