no. 2
Boundary observability for the space semi-discretizations of the 1-d wave equation
ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 2, pp. 407-438 
@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: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {407--438},
     year = {1999},
     publisher = {EDP Sciences},
     volume = {33},
     number = {2},
     mrnumber = {1700042},
     zbl = {0947.65101},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1999__33_2_407_0/}
}
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Infante, Juan Antonio; Zuazua, Enrique. Boundary observability for the space semi-discretizations of the $1-d$ wave equation. ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 2, pp. 407-438. https://www.numdam.org/item/M2AN_1999__33_2_407_0/

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