%0 Journal Article %A Eliopoulou, Helen %A Karcanias, Nicos %T Properties of reachability and almost reachability subspaces of implicit systems: The extension problem %J Kybernetika %D 1995 %P 530-540 %V 31 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1995__31_6_a1/ %G en %F KYB_1995__31_6_a1