@article{COCV_2008__14_4_759_0,
     author = {Tatsien Li Daqian Li},
     title = {Exact boundary observability for quasilinear hyperbolic systems},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {759--766},
     publisher = {EDP-Sciences},
     volume = {14},
     number = {4},
     year = {2008},
     doi = {10.1051/cocv:2008007},
     mrnumber = {2451794},
     zbl = {1155.93015},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv:2008007/}
}