1. Regularly persistent observers for bilinear systems;Bornard,1988
2. Synthesis of nonlinear observers: A harmonic-analysis approach;Celle;Mathematical Systems Theory,1989
3. Non-linear estimators for chemical reactors;Gibon Fargeot;Chemical Engineering Science,1994
4. Chapter: Topological properties of observer's inputs;Hammouri,1991
5. Stochastic Processes and Filtering Theory;Jazwinski,1970