%0 Journal Article %A Ervedoza, Sylvain %T Observability properties of a semi-discrete 1d wave equation derived from a mixed finite element method on nonuniform meshes %J ESAIM: Control, Optimisation and Calculus of Variations %D 2010 %P 298-326 %V 16 %N 2 %I EDP-Sciences %U https://doi.org/10.1051/cocv:2008071 %R 10.1051/cocv:2008071 %G en %F COCV_2010__16_2_298_0