1. Milieu Ltd., WRc and RPA: Environmental economic and social impacts of the use of sewage sludge on land. Final Report. Part III: Project Interim Reports (2010).
2. Tiruneh, A.T., Faridan, A.O., Mtshali, J.S.: Evaluation of the risk of heavy metals in sewage sludge intended for agricultural application in Swaziland. IJEST 5(1), 197–206 (2014)
3. Andreoli, C.V., Sperling, M., Fernandes, F.: Sludge treatment and disposal. Biological wastewater treatment series, vol 6, IWA publishing, London (2007)
4. Latare, A.M., Kumar, O., Singh, S., Gupta, A.: Direct and residual effect of sewage sludge on yield, heavy metals content and soil fertility under rice-wheat system. Ecol. Eng. 69, 17–24 (2014)
5. Clarke, B.O., Smith, S.R.: Review of ‘emerging’ organic pollutants in biosolids and assessment of international research priorities for the agricultural use and biosolids. Environ. Int. 37, 226–247 (2011)