Elliptic control problems with gradient constraints—variational discrete versus piecewise constant controls

A note on the approximation of elliptic control problems with bang-bang controls

Deckelnick, Klaus, (2012)

Discretization of interior point methods for state constrained elliptic optimal control problems: optimal error estimates and parameter adjustment

Hinze, Michael, (2011)

A posteriori error estimates for a finite element discretization of interior point methods for an elliptic optimization problem with state constraints

Wollner, W., (2010)