%0 Journal Article %A Liu, Wei-Jiu %T Exact distributed controllability for the semilinear wave equation. %J Portugaliae mathematica %D 2000 %P 493-508 %V 57 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_2000__57_4_48872/ %G en %F PORMA_2000__57_4_48872