@article{M2AN_1999__33_2_407_0,
     author = {Infante, Juan Antonio and Zuazua, Enrique},
     title = {Boundary observability for the space semi-discretizations of the $1-d$ wave equation},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {407--438},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {2},
     year = {1999},
     mrnumber = {1700042},
     zbl = {0947.65101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1999__33_2_407_0/}
}