@article{ding2008using,
  title={Using conditional random fields to extract contexts and answers of questions from online forums},
  author={Ding, Shilin and Cong, Gao and Lin, Chin-Yew and Zhu, Xiaoyan},
  journal={Proceedings of ACL-08: HLT},
  pages={710--718},
  year={2008}
}