@article{COCV_2013__19_2_317_0,
     author = {Kunisch, Karl and Wachsmuth, Daniel},
     title = {On time optimal control of the wave equation, its regularization and optimality system},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {317--336},
     publisher = {EDP-Sciences},
     volume = {19},
     number = {2},
     year = {2013},
     doi = {10.1051/cocv/2012010},
     mrnumber = {3049713},
     zbl = {1268.49025},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv/2012010/}
}