@InProceedings{umemura-church:2000:EMNLP,
  author    = {Kyoji Umemura  and  Kenneth W. Church},
  title     = {Empirical Term Weighting and Expansion Frequency},
  booktitle = {2000 Joint SIGDAT Conference on Empirical Methods in Natural Language Processing and Very Large Corpora},
  month     = {October},
  year      = {2000},
  address   = {Hong Kong, China},
  publisher = {Association for Computational Linguistics},
  pages     = {117--123},
  url       = {http://www.aclweb.org/anthology/W00-1315},
  doi       = {10.3115/1117794.1117809}
}