@article{PORMA_2000__57_4_48872,
     author = {Liu, Wei-Jiu},
     title = {Exact distributed controllability for the semilinear wave equation.},
     journal = {Portugaliae mathematica},
     pages = {493--508},
     publisher = {mathdoc},
     volume = {57},
     number = {4},
     year = {2000},
     zbl = {0967.93009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2000__57_4_48872/}
}