@article{SchindeleBorzi2016,
  author    = {Andreas Schindele and Alfio Borz{\`i}},
  title     = {Proximal Methods for Elliptic Optimal Control Problems with Sparsity Cost Functional},
  journal   = {Applied Mathematics},
  volume    = {7},
  number    = {9},
  doi       = {10.4236/am.2016.79086},
  year      = {2016},
}