1. Standard test method for interfacial tension of oil against water by the ring method, D971–82;ASTM,1984
2. Standard test method for interfacial tension of electrical insulating oils of petroleum origin against water by the drop-weight method, D2285–68;ASTM,1984
3. Standard test method for zeta potential of colloids in water and waste water D-4187–82;ASTM,1984
4. Encyclopedia of Emulsion Technology, Vol. 1, Basic Theory,1983
5. An experimental investigation into the induced air flotation of fine oil in water emulsions;Behie;Water Poll. Res. J. Canada.,1982