@article{MeyerPruefertTroeltzsch2007, author = {Christian Meyer and Uwe Pr{\"u}fert and Fredi Tr{\"o}ltzsch}, title = {On two numerical methods for state-constrained elliptic control problems}, journal = {Optimization Methods and Software}, volume = {22}, number = {6}, pages = {871 -- 899}, url = {http://www.math.tu-berlin.de/~pruefert/Publicat/index_en.html}, year = {2007}, }