1. H.W. Campbell, R.J. Rush, R. Tew, Sludge dewatering design manual, Canada-Ontario Agreement Res. Rep. No. 72, Ontario Ministry of the Environment, Toronto, Ont., 1978.
2. The use of rheology for sludge characterization;Campbell;Water Sci. Technol.,1982
3. Assessment of sludge conditionability using rheological properties;Campbell,1983
4. Automatic control of polymer addition for sludge conditioning;Campbell,1985
5. An instrument for automated control of sludge conditioning;Campbell,1986