@article{dualhoopshaveuniquehalving,
  title = {(Dual) Hoops Have Unique Halving},
  author = {Rob Arthan and Paulo Oliva},
  year = {2012},
  eprint = {1203.0436},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1203.0436v2},
}