P. J. M. da Silva, A. M. C. Horbe, and M. A. Horbe, “Mineralogy and geochemistry of manganese occurrences from Alto Tapajós basin, southeastern Amazonas State, Brazil”, bcnaturais, vol. 7, no. 1, pp. 11–28, Apr. 2012, doi: 10.46357/bcnaturais.v7i1.603.