@article{onofflineevaluationofrecommendersystems,
  title = {A Critical Study on Data Leakage in Recommender System Offline Evaluation},
  author = {Yitong Ji and Aixin Sun and Jie Zhang and Chenliang Li},
  year = {2020},
  eprint = {2010.11060},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2010.11060v4},
}