References
- Modern Information Retrieval Baeza-Yates, R.;B. Ribeiro-Neto
- Behaviour and the Principle of Least Effort Zipf, H. P.
- American Journal of Psychology v.71 Tests of a statistical explanation of the reank-frequency relation for words in written English Miller, G. A.;E. B. Newman
- Infroamtion and Control v.1 Length-frequency statistics for written English Miller, G. A.;E. B. Newman;E. A. Friedman
- IBM Jouranl of Research and Development v.2 The Automatic Creation of Literature Abstracts Luhn
- 한국어 형태소 분석과 정보 검색 강승식