@InProceedings{pang-kumar:2011:ACL-HLT2011,
  author    = {Pang, Bo  and  Kumar, Ravi},
  title     = {Search in the Lost Sense of ``Query'': Question Formulation in Web Search Queries and its Temporal Changes},
  booktitle = {Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {135--140},
  url       = {http://www.aclweb.org/anthology/P11-2024}
}