@article{zosso2017efficient,
  title={An efficient primal-dual method for the obstacle problem},
  author={Zosso, Dominique and Osting, Braxton and Xia, Mandy and Osher, Stanley J},
  journal={Journal of Scientific Computing},
  volume={73},
  pages={416--437},
  year={2017},
  publisher={Springer}
}