%0 Journal Article %A Barbara Bily %T Optimal control for 2-D nonlinear control systems %J Applicationes Mathematicae %D 2002 %P 239-249 %V 29 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am29-2-8/ %R 10.4064/am29-2-8 %G en %F 10_4064_am29_2_8