1. Hulka B. S. Wilcosky T. C. and Griffith J. D. Biological Markers in
2. Epidemiology. Oxford University Press New York 1990.
3. National Research Council. Biological Markers in Reproductive Toxicology. Na
4. tional Academy Press Washington DC 1989.
5. Lippmann S. M. Lee J. S. and Lotan R. Biomarkersas intermediate end points