1. . Fault detection observer design for linear systems with unknown inputs. Proceedings of the 2nd European Control Conference, Groningen, Holland, 1993; 1975-1980.
2. Design of unknown input observers and robust fault detection filters
3. Fault detection and isolation observers
4. . Monitoring and diagnostics of a class of nonlinear systems using a nonlinear unknown input observer. Proceedings of IEEE CCA, 1996; 1006-1011.
5. . A variable structure adaptive observer approach for actuator fault detection and diagnosis in uncertain nonlinear systems. Proceedings of American Control Conference, Chicago, U.S.A., 2000; 2674-2678.