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\bibitem{VanGrieken+Worobiec2011} {\textquotedblleft}\textit{X-ray spectrometry for preventive conservation of cultural heritage}{\textquotedblright}. Van Grieken R, Worobiec A, Pram{\r a}na: a journal of physics \textbf{72}, 191 (2011).   http://doi.org/10.1007/S12043-011-0041-3

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