@misc{PruefertTroeltzschWeiser2004, author = {Uwe Pr{\"u}fert and Fredi Tr{\"o}ltzsch and Martin Weiser}, title = {The convergence of an interior point method for an elliptic control problem with mixed control-state constraints.}, institution = {Technische Universit{\"a}t Berlin}, type = {preprintmatheon}, year = {2004}, }