1. World Health Organisation, Geneva (1993) Guidelines for drinking-water quality
2. European Economic Community, Luxembourg (1980) Council directive relating to the quality of water intended for human consumption 80/778/EEC
3. Pontius FW (1990) J Am Water Works Assoc 82: 32
4. de Zuane J (1990) Handbook of drinking water quality - standards and controls. Van Nostrand Reinhold, New York
5. European Economic Community. Luxembourg (1992) European community environment legislation