@techreport{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 = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {04-47}, language = {eng}, year = {2004} }