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\bibitem{Proost_etal2004} {\textquotedblleft}\textit{Determination of localized Fe$^{2+}$/Fe$^{3+}$ ratios in inks of historic documents by means of \mu-XANES}{\textquotedblright}. Proost K, Janssens K, Wagner B, Bulska E, Schreiner M, Nuclear instruments and methods in physics research: B: beam interactions with materials and atoms \textbf{213}, 723 (2004).   http://doi.org/10.1016/S0168-583X(03)01693-8

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