1. Bryce-Smith D, Stephens R (1980) Lead or health, 2nd edn. The Conservation Society, London
2. WHO (1977) Environmental Health Criteria 3: Lead. World Health Organisation, Geneva
3. Davis JM, Svendsgaard DJ (1987) Nature 329:297?300
4. US Environmental Protection Agency (1986) Air quality criteria for lead. Office of Health and Environmental Assessment, Research Triangle Park
5. Bloom H, Smythe LE (1983/4) Search 14:315?319