%0 Journal Article %A Girejko, Ewa %A Bartosiewicz, Zbigniew %T Viability and generalized differential quotients %J Control and Cybernetics %D 2006 %P 815-829 %V 35 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CC_2006_35_4_a5/ %G en %F CC_2006_35_4_a5