%0 Journal Article %A Haraux, A. %T An alternative functional approach to exact controllability of reversible systems. %J Portugaliae mathematica %D 2004 %P 399-437 %V 61 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_2004__61_4_51425/ %G en %F PORMA_2004__61_4_51425