ORTIZ, Fábio Rogério, Osmar Rodrigues BRITO, and Clóvis Manuel BORKERT. 2007. “EXTRACTING SOLUTIONS FOR QUANTIFICATION OF ZINC, COPPER AND MANGANESE IN A SANDY SOIL”. Scientia Agraria 8 (1):95-98. https://doi.org/10.5380/rsa.v8i1.8348.