Rosolem, C. A.; Bessa, M. A.; Amaral, P. G. do; Pereira, H. F. M. Soil Manganese, Its Determination, and Manganese Toxicity in Soybeans. PAB 1992, 27 (2), 277-285. https://doi.org/10.1590/S1678-3921.pab1992.v27.3648.