1. Use of recycled wash water and returned plastic concrete in the production of fresh concrete;Borger;Adv Cement Based Mater,1994
2. Council Directive 96/61/EC of 24 September 1996 concerning integrated pollution prevention and control.
3. Cement and concrete;Chilsholm;Green Res Build,1996
4. Waste Strategy 2000 for England and Wales,2000
5. Digest of Environmental Statistics,1998