Zhang, H., Y. Huang, S. Zhou, L. Wei, Z. Guo, y J. Li. «Pollution Level and Risk Assessment of Heavy Metals in Sewage Sludge from Eight Wastewater Treatment Plants in Wuhu City, China». Spanish Journal of Agricultural Research, Vol. 18, n.º 2, septiembre de 2020, p. e1103, doi:10.5424/sjar/2020182-15796.