Lobo, Thomaz Figueiredo, Helio Grassi Filho, Leonardo Theodoro Büll, and Lais Lorena Queiroz Moreira. 2013. “Management of Sewage Sludge and Mineral Nitrogen in Soil Fertility over Time”. Semina: Ciências Agrárias 34 (6):2705-26. https://doi.org/10.5433/1679-0359.2013v34n6p2705.