1. G. Besançon. Contributions à l'Etude et à l'Observation des Systèmes Non Linéaires avec Recours au Calcul Formel. PhD thesis, Institut National Polytechnique de Grenoble, 1996. Laboratoire d'Automatique de Grenoble.
2. G. Besançon and H. Hammouri, “On uniform observation of non-uniformly observable systems,” Systems & Control Letters, vol. 33, no. 1, pp. 1–11, 1996.
3. G. Besançon and G. Bornard. “A condition for cascade time-varying linearization,” in IFAC Proc., Nonlinear Control Systems Design Symposium, Tahoe City, CA, USA, pp. 684–689, 1995.
4. G. Besançon, G. Bornard, and H. Hammouri. “Observer synthesis for a class of nonlinear control systems,” Europ. Journal of Control, vol. 3, no. 1, pp. 176–193, 1996.
5. G. Besançon and G. Bornard. “State equivalence based observer design for nonlinear control systems,” in Proc. IFAC World Congress, San Francisco, CA, USA, pp. 287–292, 1996.