Rosolem, Ciro A., Marco A. Bessa, Pedro G. do Amaral, and Hélio F. M. Pereira. 1992. “Soil Manganese, Its Determination, and Manganese Toxicity in Soybeans”. Pesquisa Agropecuaria Brasileira 27 (2):277-85. https://doi.org/10.1590/S1678-3921.pab1992.v27.3648.