Clustering queries for better document ranking. Liu, Y., Zhang, L., Song, R., Nie, J., & Wen, J.R 2009.
bibtex   
@conference{ liu2009clustering,
  title = {Clustering queries for better document ranking},
  booktitle = {Proceedings of the 18th ACM conference on Information and knowledge management},
  year = {2009},
  pages = {1569{–}1572},
  publisher = {ACM},
  organization = {ACM},
  author = {Liu, Yi and Zhang, Liangjie and Song, Ruihua and Jian-Yun Nie and Wen, Ji-Rong}
}

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