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\bibitem{Darchuk_etal2011} {\textquotedblleft}\textit{Composition of prehistoric rock-painting pigments from Egypt (Gilf K{\'e}bir area)}{\textquotedblright}. Darchuk L, Gatto Rotondo G, Swaenen M, Worobiec A, Tsybrii Z, Makarovska Y, Van Grieken R, Spectrochimica acta: part A: molecular and biomolecular spectroscopy \textbf{83}, 34 (2011).   http://doi.org/10.1016/J.SAA.2011.06.054

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