Vendrame, Pedro Rodolfo Siqueira, Osmar Rodrigues Brito, Cécile Quantin, and Thierry Becquer. 2007. “Availability of Copper, Iron, Manganese and Zinc in Soils under Pastures in the Brazilian Cerrado”. Pesquisa Agropecuaria Brasileira 42 (6):859-64. https://doi.org/10.1590/S1678-3921.pab2007.v42.7639.