@article{CC_2008_37_1_a1,
     author = {de Los Reyes, J. C. and Merino, P. and Rehberg, J. and Tr\"oltzsch, F.},
     title = {Optimality conditions for state-constrained {PDE} control problems with time-dependent controls},
     journal = {Control and Cybernetics},
     pages = {5--38},
     year = {2008},
     volume = {37},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_1_a1/}
}