%0 Journal Article %A D. Niewinowska-Jacak %T Optimal control in linear systems without the condition of regular controllability %J Applicationes Mathematicae %D 1980 %P 473-479 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am-17-3-473-479/ %R 10.4064/am-17-3-473-479 %G en %F 10_4064_am_17_3_473_479