1. Impact in Scotland of UK and EC Sewage Legislation
2. Jacobs, L. W.; O'Connor, G. A.; Overcash, M. A.; Zabik, M. J.; Rygiewicz, P.InLand Application of Sludge; Page, A. L., Logan, T. G., Ryan, J. A., Eds.Lewis Publishers: Chelsea,MI, 1987; pp101-143.
3. Crathorne, B.; Donaldson, K.; James, A.; Rogers, H. R.InOrganic Contaminants in Waste, Water, Sludge and Sediment-Occurence, Fate and Disposal; Quaghebeur, D., Temmerman, I., Angeletti, G., Eds.Elsevier Applied Science: London, 1989; pp45-65.