[online]. Available: http://www.aehs.com/publications/catalog/contents/Volume3.pdf [accessed July 23, 2008].
ILSI (International Life Science Institute). 1999. A Framework for Cumulative Risk Assessment, B. Mileson, E. Faustman, S. Olin, P. B. Ryan, S. Ferenc, and T. Burke, eds. Washington, DC: International Life Science Institute [online]. Available: http://rsi.ilsi.org/NR/rdonlyres/613A82AA-E74F-40B2-BA381548A9C6AD8C/0/rsiframrpt.pdf [accessed July 23, 2008].
MADEP (Massachusetts Department of Environmental Protection). 2002. Characterization of Risks Posed by Petroleum Contaminated Sites: Implementation of MADEP VPH/EPH Approach. Final October 31, 2002. Policy No. WSC-02-411. Commonwealth of Massachusetts Executive Office of Environmental Affairs, Department of Environmental Protection [online]. Available: http://www.mass.gov/dep/cleanup/laws/02-411.pdf [accessed July 22, 2008].
MADEP (Massachusetts Department of Environmental Protection). 2003. Updated Petroleum Hydrocarbon Fraction Toxicity Values for the VPH/EPH/APH Methodology. Office of Research and Standards, Massachusetts Department of Environmental Protection, Boston, MA. November 2003 [online]. Available: http://www.mass.gov/dep/cleanup/laws/tphtox03.pdf [accessed July 22, 2008].
Norberg, L., and G. Wahlström. 1988. Anaesthetic effects of flurazepam alone and in combination with thiopental or hexobarbital evaluated with an EEG-threshold method in male rats. Arch. int. Pharmacodyn. 292:45-57.
OEHHA (Office of Environmental Health Hazard Assessment). 2008. Toxicity Criteria Database. Office of Environmental Health Hazard Assessment, California Environmental Protection Agency [online]. Available: http://www.oehha.ca.gov/risk/chemicalDB//index.asp [accessed July 23, 2008].
Teuschler, L.K., G.E. Rice, C.R. Wilkes, J.C. Lipscomb, and F.W. Power. 2004. A feasibility study of cumulative risk assessment methods for drinking water disinfection by-product mixtures. J. Toxicol. Environ. Health Part A 67(8-10):755-777.
Van den Berg, M., L. Birnbaum, A.T. Bosveld, B. Brunström, P. Cook, M. Feeley, J.P. Giesy, A. Hanberg, R. Hasegawa, S.W. Kennedy, T. Kubiak, J.C. Larsen, F.X. van Leeuwen, A.K. Liem, C. Nolt, R.E. Peterson, L. Poellinger, S. Safe, D. Schrenk, D. Tillitt, M. Tysklind, M. Younes, F. Waern, and T. Zacharewski. 1998. Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife. Environ. Health Perspect. 106(12):775-792.
Van den Berg, M., L.S. Birnbaum, M. Denison, M. De Vito, W. Farland, M. Feeley, H. Fiedler, H. Hakansson, A. Hanberg, L. Haws, M. Rose, S. Safe, D. Schrenk, C. Tohyama, A. Tritscher, J. Tuomisto, M. Tysklind, N. Walker, and R.E. Peterson. 2006. The 2005 World Health Organization reevaluation of human and mammalian toxic equivalency factors for dioxins and dioxin-like compounds. Toxicol. Sci. 93(2):223-241.