@article{qdeequestiondifficultyandexpertise,
  title = {QDEE: Question Difficulty and Expertise Estimation in Community Question Answering Sites},
  author = {Jiankai Sun and Sobhan Moosavi and Rajiv Ramnath and Srinivasan Parthasarathy},
  year = {2018},
  eprint = {1804.00109},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1804.00109v2},
}