1. 1. R. A. Zingaro and W. C. Cooper, “Selenium”, Chap. 11, Van Nostrand Reinhold, New York, 1974.
2. 1988 McCollum award lecture. The New Zealand selenium experience
3. 5. Environmental Protection Agency, “Drinking Water and Health”, Recommendation of the US National Academy of Sciences, Federal Register 42, 3573 (1977).