1. Safe biotechnology 9: values in risk assessment for the environmental application of microorganisms;The Safety in Biotechnology Working Party of the European Federation of Biotechnology and O. Doblhoff-Dier;Trends in Biotechnology,1999
2. NRC (1983). Risk Assessment in the Federal Government. National Academy of Sciences. Washington, DC
3. A. Kortenkamp, T. Backhaus, M. Faust, State of the Art Report on Mixture Toxicity. Final Report, Part 1. European Commission. Study contract no. 070307/2007/485103/ETU/D.1 (2009).
4. Biosolids Applied to Land: Advancing Standards and Practices;National Academy of Sciences,2002
5. U.S. Environmental Protection Agency, Framework for ecological risk assessment. Report no. EPA/630/R-92/001. Risk Assessment Forum. Washington, DC (1992).