@article{twodifferentiallyprivateratingcollection,
  title = {Two Differentially Private Rating Collection Mechanisms for Recommender Systems},
  author = {Wenjie Zheng},
  year = {2016},
  eprint = {1604.08402},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1604.08402v1},
}