1. Rector AL, Nowlan WA, Consortium G, et al. The galen project. Comput Methods Prog Biomed. 1994; 45(1):75–8.
2. Spackman KA, Campbell KE, Côté RA. Snomed rt: a reference terminology for health care. In: Proceedings of the AMIA Annual Fall Symposium. Philadelphia: Hanley & Belfus, Inc.;1997. p. 640.
3. Elkin PL, Brown SH, Husser CS, Bauer BA, Wahner-Roedler D, Rosenbloom ST, Speroff T. Evaluation of the content coverage of snomed ct: ability of snomed clinical terms to represent clinical problem lists. In: Mayo Clinic Proceedings. Amsterdam: Elsevier;2006. p. 741–8.
4. Hardiker NR, Rector AL. Modeling nursing terminology using the grail representation language. J Am Med Inform Assoc. 1998; 5(1):120–8.
5. Ashburner M, Ball CA, Blake JA, Botstein D, Butler H, Cherry JM, Davis AP, Dolinski K, Dwight SS, Eppig JT, et al. Gene ontology: tool for the unification of biology. Nat Genet. 2000; 25(1):25–9.