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\bibitem{Cardell_etal2002} {\textquotedblleft}\textit{Applying digital image processing to SEM-EDX and BSE images to determine and quantify porosity and salts with depth in porous media}{\textquotedblright}. Cardell C, Yebra A, Van Grieken RE, Microchimica acta \textbf{140}, 9 (2002).   http://doi.org/10.1007/S006040200063

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