1. Aone, C., Halverson, L., Hampton, T. and Ramos-Santacruz, M. SRA (1998). “Description of the IE2 System Used for MUC-7,” in Proc 7th Message Understanding Conference.
2. Aronson, A. R. (2001). “Effective Mapping of Biomedical Text to the UMLS Metathesaurus: the MetaMap Program,” in Proceedings of the AMIA Annual Fall Symposium, pp. 17–21.
3. Bush, V. (1945). “As We May Think,” The Atlantic Monthly, 176(1):101–108.
4. Chowdury C. G. (1999). Introduction to Modern Information Retrieval. Library Association Publishing.
5. Craven, T. C. (1978). Linked Phrase Indexing. Information Processing and Management, 14(6):469–76.