1. Anonymous (1972) BASF handbook — the ’Trilon’ Range of Sequestrants, p. 10.
2. Anonymous (1976) BS 5283: Glossary of Terms Relating to Disinfection, British Standards Institute, London, p. 4.
3. Block, S.S. (1977) Disinfection, Sterilisation and Preservation, Lea & Febiger.
4. Elmore, D.G. (1980) Proceedings of the Brewing Technology Conference, Harrogate, 8.
5. Hobbs, G. and Wilson, G. S. (1942) Journal of Hygiene, 42, 436.