Prediction of Ba, Co and Ni for tropical soils using diffuse reflectance spectroscopy and X-ray fluorescence spectroscopy - Camargo, Livia Arantes; Marques Júnior, José; Alleoni, Luís Reynaldo Ferracciú; Pereira, Gener Tadeu; Teixeira, Daniel De Bortoli; Bahia, Angélica Santos Rabelo de Souza (Geophysical Research Abstracts, 2017)