@article{EJDE_2010__2010__a204,
     author = {Wehbe,  Ali},
     title = {Observability and controllability for a vibrating string with dynamical boundary control},
     journal = {Electronic journal of differential equations},
     year = {2010},
     volume = {2010},
     zbl = {1198.35141},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a204/}
}