Teixeira, R. A., E. S. de Souza, J. R. Ferreira, and A. R. Fernandes. “Potentially Toxic Elements in Soils and Contamination Indices at the Serra Pelada Gold Mine, Para, Brazil”. Bioscience Journal, vol. 34, no. 6, Dec. 2018, pp. 1477-8, doi:10.14393/BJ-v34n6a2018-39661.