Schreiber, R. “Quality Assurance in the Analytical Laboratory: Calibration Qualification Documentation As Required by CGMP, GLP, ISO 9000, and EN 45001”. CHIMIA 51, no. 1-2 (February 26, 1997): 14. Accessed May 4, 2024. https://www.chimia.ch/chimia/article/view/1997_014.