1. Products You Can Have Confidence,1997
2. Pre-Purchase Questionnaire: Form PPQ 1/98. NHS Supplies, Scottish Healthcare Supplies, Northern Ireland Central Services Agency, Welsh Health Supplies, Association of British Healthcare Industries.
3. Council Directive 93/42/EEC of 14 June 1993 Concerning Medical Devices,1993
4. Article 5,1993
5. 93/465/EEC: Council Decision of 22 July 1993 concerning the modules for the various phases of the conformity assessment procedures and the rules for the affixing and use of the CE conformity marking, which are intended to be used in the technical harmonization directives.