1. American Public Health Association (APHA, Ed.), Standard Methods for the Examination of Water and Wastewater, 21th, Washington, DC, 2005, pp. 5–47.
2. HERA, LAS Human and Environmental Risk Assessment Report, Brussels, Belgium, 2004, p. 6.
3. HERA, AES Environmental Risk Assessment Report, Brussels, Belgium, 2002, pp. 6–9.
4. HERA, Alkyl Sulphates Environmental Risk Assessment Report, Brussels, Belgium, 2002, pp. 5–9.