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2. Dacre, J. C.: 1980, ?Potential Hazard of Toxic Organic Residues in Sludge?, in G. Bitton, B. L. Damron, G. T. Edds, and J. M. Davidson (eds.), Sludge: Health Risks of Land Application, Ann Arbor Science Publ. Inc., Ann Arbor, Michigan, pp. 85?102.
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4. De Lappe, B. W., Risebrough, R. W., and Walker II, W.: 1983, Can. J. Fish. Aquatic Sci. 40 (Suppl. 2), 322.
5. EPA: 1979, Methods for Chemical Analysis of Water and Wastes, Environmental Protection Agency, Report No. EPA-600/4-79-020, Cincinnati, Ohio.