1. “Extended Luenberger observers for nonlinear multivariable systems“;Birk;Int. J. Control,1988
2. M. Cohen de Lara and J. Lévine, “Local identification of nonlinear systems, bifurcations and normal forms“, in “Analysis of Controlled Dynamical Systems“, Proc. of an Internat. Conf., Lyon, France, July 3–6 1990, B. Bonnard, B. Bride, J.P. Gauthier, I. Kupka eds., Birkhäuser, Boston, 1991, pp. 316–325.
3. “Eliminating Input Derivatives and Lowering their Orders in Generalized State-Space Representations“;Delaleau,1992
4. S. Diop, “Rational System Equivalence and Generalized Realization Theory“, These Proceedings.
5. “Automatique et corps différentiels“;Fliess;Forum Math.,1989