1. Water Clarification by Flotation: 2;Packham,1972
2. Water Clarification by Flotation: 3;Packham,1975
3. Zabel , T.F. Hyde , R.A. Factors Influencing Dissolved-air Flotation as Applied to Water Clarification Proc. Conf. on Flotation for Water and Waste Treatment Medmenham, UK 1977
4. Water Clarification by Flotation: 5;Rees,1979