A posteriori error estimation and adaptivity for elliptic optimal control problems with state constraints. - Olaf Benedix; Boris Vexler (Comput. Optim. Appl., 2009)

A Priori Mesh Grading for an Elliptic Problem with Dirac Right-Hand Side. - Thomas Apel; Olaf Benedix; Dieter Sirch; Boris Vexler (SIAM J. Numer. Anal., 2011)