1. Fensel, D., F. van Harmelen, I. Horrocks, D.L. McGuiness, P.F. Patel-Schneider, (2001) OIL: An Ontology Infrastructure for the Semantic Web, IEEE Intelligent Systems (16)
2. Brewster, C. (2002) Techniques for Automated Taxonomy Building: Towards Ontologies for Knowledge Management, in Proceeding of the 5 th Annual CLUK Research Colloquium, Leeds
3. Ericsson, K. A. & H. A. Simon, (1984) Protocol Analysis: verbal reports as data. Cambridge, Mass.: MIT Press
4. Brewster, C., F. Ciravegna, and Y. Wilks, (2001) Knowledge Acquisition for Knowledge Management: Position Paper, in Proceeding of the IJCAI-2001 Workshop on Ontology Learning held in conjuction with the 17th International Conference on Artificial Intelligence (IJCAI-01), Seattle, August, 2001
5. Grefenstette, Gregory, (1994), Explorations in Automatic Thesaurus Discovery, Amsterdam: Kluwer.