1. A. BENSOUSSAN.-On the equation of nonlinear filtering. Manuscript (1981).
2. J.M. BISMUT.-Partially observed diffusions and their control Siam J. control, to appear
3. J.M. BISMUT-D. MICHEL.-Diffusions Conditionnelles. I.Hypoellipticité partielle. J. of Functional Analysis 44, 174–211 (1981).
4. P. BREMAUD.-Prédiction, Filtrage et détection pour une observation mixte: méthode de la probabilité de référence. Thèse Doctorat, Univ-Paris VI (1976).
5. B. CIREL'SON.-An example of a stochastic differential equation not possessing a strong solution. Theory of Probability and its applications 20, 427–430 (1975).