1. Agency for Toxic Substances and Disease Registry: The Nature and Extent of Lead Poisoning in Children in the United States: A Report to Congress, US Department of Health and Human Services, Public Health Services, Washington, 1988.
2. Aitio A, Riihimäki V, Vainio H (eds.): Biological Monitoring and Surveillance of Workers Exposed to Chemicals, Hemisphere Publishing, Washington, 1984.
3. Aitio A, Järvisalo J, Riihimäki V, et al: Biological monitoring. In: Occupational Medicine: Principles and Practical Applications, 2nd ed, p 178, Zenz C (ed.), Year Book Medical Publishers, Chicago, 1988.
4. Aldridge WN, Barnes JM, Johnson MK: Studies on delayed neurotoxicity produced by some organo-phosphate compounds. Ann NY Acad Sci 160:314, 1969.
5. Alessio L, Castoldi MR, Monelli O, et al: Indicators of internal dose in current and past exposure to lead. Int Arch Occup Environ Health 44:127, 1979.