@InProceedings{liu-EtAl:2009:EMNLP1,
  author    = {Liu, Zhiyuan  and  Li, Peng  and  Zheng, Yabin  and  Sun, Maosong},
  title     = {Clustering to Find Exemplar Terms for Keyphrase Extraction},
  booktitle = {Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing},
  month     = {August},
  year      = {2009},
  address   = {Singapore},
  publisher = {Association for Computational Linguistics},
  pages     = {257--266},
  url       = {http://www.aclweb.org/anthology/D/D09/D09-1027}
}