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\bibitem{Alfeld_etal2013} {\textquotedblleft}\textit{Scanning XRF investigation of a Flower Still Life and its underlying composition from the collection of the Kr{\"o}ller-Muller Museum}{\textquotedblright}. Alfeld M, van der Snickt G, Vanmeert F, Janssens K, Dik J, Appel K, van der Loeff L, Chavannes M, Meedendorp T, Hendriks E, Applied physics A : materials science \& processing \textbf{111}, 165 (2013).   http://doi.org/10.1007/S00339-012-7526-X

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