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\bibitem{CostaDantas_etal1981} {\textquotedblleft}\textit{Analise de solos por meio de fluorescencia de raios-X nao-dispersiva}{\textquotedblright}. Costa Dantas C, Da Silveira Dantas H, Van {\textquoteright}t dack L, Van Grieken R, Qu{\'\i}mica nova \textbf{4}, 110 (1981)

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