%0 Journal Article %A Kaczorek, Tadeusz %T Some recent results in singular 2-D systems theory %J Kybernetika %D 1991 %P 253-262 %V 27 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1991__27_3_a9/ %G en %F KYB_1991__27_3_a9