1. Anonymous, 1989. EN 45001. General criteria for the operation of testing laboratories, CEN, France.
2. Anonymous, 1991. ISO 4833 Microbiology – General Guidance for the Enumeration of Micro-organisms – Colony-count Technique at 30°C. International Organization for Standardization, Geneva, Switzerland.
3. Anonymous, 1993. ISO 7932, Microbiology – General Guidance for the Enumeration of Bacillus cereus – Colony-count Technique at 30°C, 2nd Edition. International Organization for Standardization, Geneva, Switzerland.
4. Anonymous, 1995. IUPAC/AOAC/ISO International harmonized protocol for the design, conduct and interpretation of method performance studies. Pure Appl.Chem. 67(2), 331–343.
5. Anonymous, 1998. DIN 10198-1 Mikrobiologische Milchuntersuchung: Bestimmung präsumtiver Bacillus cereus; Teil 1: Koloniezählverfahren bei 37 Grad C.