1. DIRECTIVE 2004/22/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 31 March 2004 on measuring instruments. (“The Measuring Instruments Directive”). Download from http://europa.eu.int/eur-lex/pri/en/oj/dat/2004/l_135/l_13520040430en00010080.pdf.
2. Thematic network MID Software. (supported by the European commission, contract no G7RT-CT-2001-05064). See www.mid-software.org.
3. International standard IEC 61508, part 1–7. “Functional safety of electrical/electronic/programmable electronic safety-related systems”. Possible to order at www.iec.ch.
4. MID Software Requirements and Validation GuideVersion 1.00, 29 October 2004. Download from www.mid-software.org.
5. MID-Software Report on Methods for Validation and Testing of Software. 29 September 2004. Download at www.mid-software.org.