@article{HaunertWolff2017,
  author    = {Jan-Henrik Haunert and Alexander Wolff},
  title     = {Beyond maximum independent set: an extended integer programming formulation for point labeling},
  journal   = {ISPRS International Journal of Geo-Information},
  volume    = {6},
  number    = {11},
  doi       = {10.3390/ijgi6110342},
  year      = {2017},
}