1. ISO 9000:2000, Quality Management Systems – Fundamentals and Vocabulary, 2000.
2. B. Wichmann et al., Validation of Software in Measurement Systems, version 2.1, NPL Best Practice Guide No. 1, ISSN 1471-4124, 2004.
3. N. Greif, H. Schrepf, Software Requirements for Measuring Systems – Examples for Requirements Catalogues, PTB Laboratory Report, PTB-8.31-2000-2, Braunschweig und Berlin, 2000.
4. Software testing and preventive quality assurance for metrology;Greif;Comput. Stand. Interface,2006