Storing and retrieving word phrases

Term dependence: a basis for Luhn and Zipf models

Journal of the American Society for Information Science and Technology

Extension of Zipf's law to words and phrases

COLING '02 Proceedings of the 19th international conference on Computational linguistics - Volume 1

Characteristics of character usage in Chinese Web searching

Information Processing and Management: an International Journal

Extending Zipf's law to n-grams for large corpora

Artificial Intelligence Review