TY - JOUR AU - Infante, Juan Antonio AU - Zuazua, Enrique TI - Boundary observability for the space semi-discretizations of the $1-d$ wave equation JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 1999 SP - 407 EP - 438 VL - 33 IS - 2 PB - EDP-Sciences UR - http://geodesic.mathdoc.fr/item/M2AN_1999__33_2_407_0/ LA - en ID - M2AN_1999__33_2_407_0 ER -