@article{exploitinghierarchyforrankingbased,
  title = {Exploiting Hierarchy for Ranking-based Recommendation},
  author = {Kouneli Marianna},
  year = {2015},
  eprint = {1512.07444},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1512.07444v1},
}