1. Fu, M., C. E. de Souza and L. Xie, $$\mathcal{H}_{\infty}$$ -Estimation for Uncertain Systems, Int. J. Robust Nonlinear Contr., vol. 2, 1992, pp. 87–105.
2. Lee, C. S. and G. Leitmann, Continuous Feedback Guaranteeing Uniform Ultimate Boundedness for Uncertain Linear Delay Systems: An Application to River Pollution Control, Comput. Math. Model., vol. 16, 1988, pp. 929–938.
3. Mahmoud, M. S., Resilient Linear Filtering of Uncertain Systems, Automatica, vol. 40, no. 10, 2004, pp. 1797–1802.
4. Mahmoud, M. S. and Abdulla Ismail, New Results on Delay-Dependent Control of Time-Delay Systems, IEEE Trans. Automat. Contr., vol. 50, 2005, pp. 95–100.
5. Alessandri, A., M. Baglietto and G. Battistelli, Leunberger Observers for Switching Discrete-Time Linear Systems, Proceedings of the 44th IEEE CDC, Seville, Spain, 2005, pp. 7014–7019.