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\bibitem{Zanaga_etal2016} {\textquotedblleft}\textit{An alternative approach for ζ-factor measurement using pure element nanoparticles}{\textquotedblright}. Zanaga D, Altantzis T, Sanctorum J, Freitag B, Bals S, Ultramicroscopy \textbf{164}, 11 (2016).   http://doi.org/10.1016/j.ultramic.2016.03.002

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