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\bibitem{Potgieter-Vermaak_etal2005} {\textquotedblleft}\textit{A characterisation of the surface properties of an ultra fine fly ash (UFFA) used in the polymer industry}{\textquotedblright}. Potgieter-Vermaak SS, Potgieter JH, Kruger RA, Spolnik Z, Van Grieken R, Fuel \textbf{84}, 2295 (2005).   http://doi.org/10.1016/J.FUEL.2005.05.013

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