@article{combatingcollusionringsishardbut,
  title = {Combating Collusion Rings is Hard but Possible},
  author = {Niclas Boehmer and Robert Bredereck and André Nichterlein},
  year = {2021},
  eprint = {2112.08444},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2112.08444v1},
}