Terra J, Sanches RO, Bueno MIMS, Melquiades FL. Multielement analysis of soils: a proposal involving a portable X-ray fluorescence equipment. Semin., Exact Tech. Scienc. [Internet]. 2014 Oct. 30 [cited 2024 Nov. 21];35(2):207-14. Available from: https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/16484