Jaffar Abdul Khaliq, S., Al-Busaidi, A., Ahmed, M., Al-Wardy, M., Agrama, H., & S. Choudri, B. (2017). The effect of municipal sewage sludge on the quality of soil and crops. International Journal of Recycling of Organic Waste in Agriculture, 6(4). https://doi.org/10.1007/s40093-017-0176-4