1. Albert, R.E. and Chen, C. (1986): U.S. EPA. diesel studies on inhalation hazards. In: Carcinogenic and Mutagenic Effects of Diesel Engine Exhaust (Ishibashi, N. et al. eds.), pp. 411-419, Elsevier Science Publishers B.V., Amsterdam and New York.
2. American Conference on Governmental Industrial Hygienists (ACGIH). (1984): Threshold limit for chemical substance and physical agents in the work environment with intended changes for 1938-84. pp. 42-93, ACGIH, Cincinnati.
3. Arcos, J.C., Argus, M.F. and Wolf, G. (1968): Introduction. In Chemical Induction of Cancer, pp. 3-7, Academic Press, New York.
4. Case–Control Study of an Acute Aflatoxicosis Outbreak, Kenya, 2004