@article{weightedclustering,
  title = {Weighted Clustering},
  author = {Margareta Ackerman and Shai Ben-David and Simina Brânzei and David Loker},
  year = {2011},
  eprint = {1109.1844},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1109.1844v2},
}