1. Merten, O. -W. (2002) Virus contaminations of cell cultures -A biotechnological view. Cytotechnol. 39: 91–116.
2. Committee for Proprietary Medicinal Products (CPMP), The European Agency for the Evaluation of Medicinal Products: Human Medicines Evaluation Unit (1996) Note for guidance on virus validation studies: the design, contribution and interpretation of studies validating the inactivation and removal of viruses (CPMP/BWP/268/95).
3. International Conference on Harmonisation (1998) Q5A Viral safety evaluation of biotechnology products derived from cell lines of human or animal origin. Fedral Register 63: 51074–51084.
4. World Health Organization (1998) WHO requirements for the use of animal cells as in vitro substrates for the production of biological. Dev. Bio. Stand. 93: 141–171.
5. Minor, P. D. (1996) Mammalian cells and their contaminants. Dev. Biol. Standard. 88: 25–29.