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\bibitem{VanGrieken_etal1979} {\textquotedblleft}\textit{Soil analysis by thin-film energy-dispersive X-ray fluorescence}{\textquotedblright}. Van Grieken R, Van {\textquoteright}t dack L, Costa Dantas C, Da Silveira Dantas H, Analytica chimica acta \textbf{108}, 93 (1979).   http://doi.org/10.1016/S0003-2670(01)93044-2

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