@InProceedings{duan-EtAl:2008:ACLMain,
  author    = {Duan, Huizhong  and  Cao, Yunbo  and  Lin, Chin-Yew  and  Yu, Yong},
  title     = {Searching Questions by Identifying Question Topic and Question Focus},
  booktitle = {Proceedings of ACL-08: HLT},
  month     = {June},
  year      = {2008},
  address   = {Columbus, Ohio},
  publisher = {Association for Computational Linguistics},
  pages     = {156--164},
  url       = {http://www.aclweb.org/anthology/P/P08/P08-1019}
}