1. World Health Organization, International Agency for Research on Cancer, IARC Monographs on the Evaluation of Carcinogenic Risks to Human 32 (1983, updated 1998) 211.
2. J.W. Hodgeson, W.J. Bashe, T.V. Baker, US Environmental Protection Agency, Method 550 (1990).
3. J.W. Hodgeson, W.J. Bashe, T.V. Baker, US Environmental Protection Agency, Method 550.1 (1990).
4. US Environmental Protection Agency, Method 610 (1982).
5. US Environmental Protection Agency, Method 8310 (1986).