@techreport{HinzeSchiela2007, author = {Michael Hinze and Anton Schiela}, title = {Discretization of Interior Point Methods for State Constrained Elliptic Optimal Control Problems: Optimal Error Estimates and Parameter Adjustment}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {07-40}, language = {eng}, year = {2007} }