@article{CRMATH_2004__338_5_413_0,
     author = {Negreanu, Mihaela and Zuazua, Enrique},
     title = {Convergence of a multigrid method for the controllability of a 1-d wave equation},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {413--418},
     publisher = {Elsevier},
     volume = {338},
     number = {5},
     year = {2004},
     doi = {10.1016/j.crma.2003.11.032},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2003.11.032/}
}