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\bibitem{Alfeld_etal2013} {\textquotedblleft}\textit{A mobile instrument for in situ scanning macro-XRF investigation of historical paintings}{\textquotedblright}. Alfeld M, Pedroso JV, van Hommes ME, van der Snickt G, Tauber G, Blaas J, Haschke M, Erler K, Dik J, Janssens K, Journal of analytical atomic spectrometry \textbf{28}, 760 (2013).   http://doi.org/10.1039/C3JA30341A

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