%0 Journal Article %A Kulczycki, Piotr %A Wisniewski, Rafael %A Kowalski, Piotr %A Krawiec, Karol %T Hard and soft sub-time-optimal controllers for a mechanical system with uncertain mass %J Control and Cybernetics %D 2004 %P 573-587 %V 33 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CC_2004_33_4_a4/ %G en %F CC_2004_33_4_a4