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\bibitem{Potgieter-Vermaak_etal2007} {\textquotedblleft}\textit{Fingerprinting of South African ordinary Portland cements, cement blends and mortars for identification purposes: discrimination with starplots and PCA}{\textquotedblright}. Potgieter-Vermaak SS, Potgieter JH, Worobiec A, Van Grieken R, Marjanovic L, Moeketsi S, Cement and concrete research \textbf{37}, 834 (2007).   http://doi.org/10.1016/J.CEMCONRES.2007.02.013

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