@article{PORMA_2004__61_4_51425,
     author = {Haraux, A.},
     title = {An alternative functional approach to exact controllability of reversible systems.},
     journal = {Portugaliae mathematica},
     pages = {399--437},
     publisher = {mathdoc},
     volume = {61},
     number = {4},
     year = {2004},
     zbl = {1065.93005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2004__61_4_51425/}
}