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\bibitem{vanPut_etal1994} {\textquotedblleft}\textit{Quantitative characterization of individual particle surfaces by fractal analysis of scanning electron microscope images}{\textquotedblright}. van Put A, Vertes A, Wegrzynek D, Treiger B, Van Grieken R, Fresenius{\textquoteright} journal of analytical chemistry \textbf{350}, 440 (1994).   http://doi.org/10.1007/BF00321787

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