@article{COCV_2008__14_2_318_0,
     author = {Ouksel, Leila},
     title = {In\'egalit\'e d'observabilit\'e du type logarithmique et estimation de la fonction de co\^ut des solutions des \'equations hyperboliques},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {318--342},
     publisher = {EDP-Sciences},
     volume = {14},
     number = {2},
     year = {2008},
     doi = {10.1051/cocv:2007052},
     mrnumber = {2394513},
     zbl = {1139.35016},
     language = {fr},
     url = {http://www.numdam.org/articles/10.1051/cocv:2007052/}
}