F. C. da Silva, A. E. Boaretto, R. S. Berton, H. B. Zotelli, C. A. Pexe, and E. M. Bernardes, “Effect of sewage sludge on the fertility of a Paleudult soil cultivated with sugarcane”, PAB, vol. 36, no. 5, pp. 831–840, May 2001, doi: 10.1590/S1678-3921.pab2001.v36.6201.