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\bibitem{Potgieter-Vermaak_etal2011} {\textquotedblleft}\textit{Degradation of galvanised iron roofing material in Tanzania by atmospheric corrosion}{\textquotedblright}. Potgieter-Vermaak SS, Mmari A, Van Grieken R, McCrindle RI, Potgieter JH, Corrosion engineering science and technology \textbf{46}, 642 (2011).   http://doi.org/10.1179/147842210X12695149033972

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