%0 Journal Article %A Hoang, S. %A Nguyen, T. L. %A Baraille, R. %A Talagrand, O. %T Approximation approach for nonlinear filtering problem with time dependent noises. I. Conditionally optimal filter in the minimum mean square sense %J Kybernetika %D 1997 %P 409-425 %V 33 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1997__33_4_a4/ %G en %F KYB_1997__33_4_a4