[1]
B. L. M. Nascimento, J. D. de Oliveira, S. S. Araújo, G. dos S. Silva, and R. dos S. Bráz, “Preliminary study of the levels of metals potentially toxic in soil after sludge disposal in natura of the station of water treatment”, Sci. Plena, vol. 9, no. 12, Jan. 2014.