James, Matthew R., Baras, John S., "An Observer Design for Nonlinear Control Systems", The 8th International Conference on Analysis and Optimization of Systems, pp. 170-180, Antibes, France, June 8-10, 1988
Baras, John S., Elliott, Robert J., Kohlmann, Michael., "The Conditional Adjoint Process", The 8th International Conference on Analysis and Optimization of Systems, pp. 654-662, Antibes, France, June 8-10, 1988
