Hafez, W., Loparo, K. A., Rasmy, E. A., & Hashish, M. A.(1989).Generation of trajectory sensitivities: minimal-order realization.International Journal of Control,49(3),809–825.
Hafez, W., Loparo, K. A., Hashish, H. A., & Rasmy, E. A.(1987).SENSITIVITY-CONSTRAINED CONTROLLER DESIGN FOR MULT I-PARAMETER SYSTEMS.Proceedings of the IASTED International Symposium Applied Control and Identification: Los Angeles, California, USA, December 10-12, 1986.