1. , , , , (2000). The NLM indexing initiative. In Proceedings of the annual Fall Symposium of the AMIA (pp. 17–21). Los Angeles, CA, USA: American Medical Informatics Association, Hanley and Belfus Inc.
2. & (2000). Using noun phrase heads to extract document keyphrases. In Proceedings of the 13th Canadian Conference on Artificial Intelligence (pp. 40–52). Montréal, Quebec, Canada: Springer LNCS.
3. , & (2006). Automated tag clustering: Improving search and exploration in the tag space. In Proceedings of the Collaborative Web Tagging Workshop, WWW Conference. (pp. 417–426). New York, NY, USA. ACM Press, Edinburgh, Scottland.
4. , , & (1995). In (Ed.), Indexing as problem solving: A cognitive approach to consistency. In Forging new partnerships in information (pp. 49–45). Medford, NJ: Information Today.
5. , , & (1998). Inductive learning algorithms and representations for text categorization. In Proceedings of the 7th International Conference on Information and Knowledge Management (CIKM) (pp. 148–155). Bethesda, Maryland, USA: ACM Press.