References
- Mastromatteo , E. 1981 . On the Concept of Threshold . Am. Ind. Hyg. Assoc. J , 42 : 763
- Martin , G. Aging and Toxicity; A Gerontological Perspective . Proceedings from the Workshop on Environmental Toxicity and the Aging Process . October 1–2 . Columbia, Maryland Sponsored by the Task Force on Environmental Cancer and Heart and Lung Disease, Environmental Protection Agency, Washington, DC