1. Information and Exponential Families;Barndorff-Nielsen,1978
2. Sufficient data reduction and exponential families;Barndorff-Nielsen;Math. Scand.,1968
3. Condizioni necessarie per l'esistenza di filtri a dimensione finita (Necessary conditions for the existence of finite dimensional filters);Ferrante,1989
4. Exact finite dimensional filters for a class of nonlinear discrete time systems;Levine;Stochastics,1986
5. Finite dimensionality in discrete time nonlinear filtering from a Bayesian Statistics viewpoint;Runggaldier,1987