Analysis of organic and mineral nitrogen, total organic carbon and humic fractions in Ferralsols: an approach using Vis-NIR-SWIR, MIR and X-ray fluorescence spectroscopy - Lima, Bruna Coelho de; Santos, Carlos H. dos; Tiritan, Carlos S; Demattê, José Alexandre Melo; Gomez, Andres Mauricio Rico; Albarracín, Heidy Soledad Rodríguez; Bartsch, Bruno dos Anjos (Discover Environment, 2024)