1. Christofides, P. D. (1998). Robust control of nonlinear processes. Proceedings of conference on dynamics and control of process systems-5, Corfu, Greece (pp. 477–483).
2. Robust semi-global output tracking for nonlinear singularly perturbed systems;Christofides;International Journal of Control,1996
3. Singular perturbations and input-to-state stability;Christofides;IEEE Transactions on Automation and Control,1996
4. Feedback control of two-time-scale nonlinear systems;Christofides;International Journal of Control,1996
5. Control of uncertain nonlinear systems;Corless;Journal of Dynamic Systems, Measurements and Control,1993