%0 Journal Article %A Władysław Hejmo %A Jacenty Kloch %T On the perturbations in a time-optimal closed-loop system %J Annales Polonici Mathematici %D 1989 %P 37-52 %V 50 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-50-1-37-52/ %R 10.4064/ap-50-1-37-52 %G en %F 10_4064_ap_50_1_37_52