[1] Besancona, G., Battilottib, S., Lanarib, L., “A New Separation Result For A Class Of Quadratic-Like SystemsWith Application To Euler Lagrange Models,” Automatica, Vol. 39, pp. 1085-1093, 2003.

[2] Canbolat, H., Burg., T., Dawson, D., and Nagarkatti, S., “A Near Output Feedback Controller For a GeneralClass of Robot Manipulator Systems,” International Journal of Systems Science, Vol. 30, No. 5, pp. 515-525.

[3] Chen, W. and Xu, C., “Simple Robust Output-Feedback Controller for Uncertain Nonlinear Systems,” IEEETransactions on Automatic Control, Vol. 46, No. 11, pp. 1765-1772.

[4] Dawson, D., Hu., J., and Burg, T., Nonlinear Control of Electric Machinery, Marcel Dekker, 1998.

[5] Feemster, M., Vedagarbha, M., Haste, D., and Dawson, D., “Adaptive Output-Feedback Control of InductionMotors,” The International Journal of Systems Science, Vol. 31, No. 10. pp. 1195-1208.

[6] Jiang, Z., and Kanellakopoulos, I., “Global Output-Feedback Tracking for a Benchmark Nonlinear System,”IEEE Transactions on Automatic Control, Vol. 45, No. 5, pp. 1023-1027.

[7] Lee, K., and Khalil, H., “Adaptive Output Feedback Control of Robot Manipulators Using High-Gain Ob-servers,”International Journal of Control, Vol. 67, No. 6, pp. 869-886.

[8] Marino, R., and Tomei, P., “Global Adaptive Output-Feedback Control of Nonlinear Systems, Part I: LinearParameterization,” IEEE Transactions on Automatic Control, Vol. 38, No. 1, pp. 17-32.

[9] Ogata, K., Modern Control Engineering, Third Edition, Prentice Hall, 1997.

[10] Oh, S., and Khalil, H., “Nonlinear Output-Feedback Tracking Using High-Gain Observer and Variable Struc-ture,”Automatica, Vol. 33, No. 10, pp. 1845-1856.

[11] Qian, C. and Lin, W., “Output Feedback Control of a Class of Nonlinear Systems: A Nonseparation PrincipleParadigm”, IEEE Transactions on Automatic Control, Vol. 47, No. 19, pp. 1710-1715.

[12] Slotine, J., and Li, W., Applied Nonlinear Control,Englewood Cliff, NJ: Prentice Hall, 1992.