@article {article2020, AUTHOR = {Brenner, Susanne C. and Gedicke, Joscha and Sung, Li-yeng}, TITLE = {{$P_1$} finite element methods for an elliptic optimal control problem with pointwise state constraints}, JOURNAL = {IMA J. Numer. Anal.}, YEAR = {2020}, VOLUME = {40}, NUMBER = {1}, PAGES = {1--28}, DOI = {10.1093/imanum/dry071}, URL = {https://doi.org/10.1093/imanum/dry071}, }