1. Information materials about SNOMED CT can be found at. [ http://www.snomed.org ]
2. World Health Organisation: International Statistical Classification of Diseases and Health Related Problems, Tenth Revision. Geneva. 1992
3. World Health Organisation: International Classification of Procedures in Medicine. Geneva. 1978
4. Rogers JE, Rector AL: Extended Core model for representation of the Common Reference Model for procedures. Deliverable D5-1 GALEN-IN-USE project. 1997, [ http://www.opengalen.org/sources/sources.html ]
5. Coté RA, Rothwell DJ, (eds), et al: SNOMED International. 1993, Northfield, Illinois USA, College of American Pathologists