%0 Journal Article %A Bensoussan, Alain %T Statistical problems in Hilbert spaces. Application to filtering theory %J Kybernetika %D 1970 %P -279 %V 06 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1970__6_4_a1/ %G en %F KYB_1970__6_4_a1