Empirical Term Weighting and Expansion Frequency Kyoji Umemura author Kenneth W Church author 2000-10 text 2000 Joint SIGDAT Conference on Empirical Methods in Natural Language Processing and Very Large Corpora Association for Computational Linguistics Hong Kong, China conference publication umemura-church-2000-empirical 10.3115/1117794.1117809 https://aclanthology.org/W00-1315/ 2000-10 117 123