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\bibitem{Janssens_etal1999} {\textquotedblleft}\textit{The non-destructive determination of REE in fossilized bone using synchrotron radiation induced K-line X-ray microfluorescence analysis}{\textquotedblright}. Janssens K, Vincze L, Vekemans B, Williams CT, Radtke M, Haller M, Kn{\"o}chel A, Fresenius{\textquoteright} journal of analytical chemistry \textbf{363}, 413 (1999).   http://doi.org/10.1007/S002160051212

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