@article{KarlNeitzelWachsmuth:2020, Title = {A {L}agrange Multiplier Method for Semilinear Elliptic State Constrained Optimal Control Problems}, Author = {Karl, V. and Neitzel, I. and Wachsmuth, D.}, Year = {2020}, note = {preprint available SPP1962-087}, annote = {journal, article}, journal ={Comput. Optim. Appl.}, voluem ={77}, pages ={831--869}, doi ={10.1007/s10589-020-00223-w} }