Rocha, Ricardo Eiras Moreira da, Márcio Sampaio Pimentel, Valéria Cristina Palmeira Zago, Norma Gouvêa Rumjanek, and Helvécio De Polli. 2003. “Evaluation of Biosolid Fed by Municipal Waste-Water Sludge As a Fertilizer in Kale”. Pesquisa Agropecuaria Brasileira 38 (12):1435-41. https://doi.org/10.1590/S1678-3921.pab2003.v38.6721.