Siddig, Nahid, Asma Ahmed, Sarra Saad, and Faisal Koua. 2019. “Heavy Metals Accumulation from Sewage Sludge in the Nile Tilapia Oreochromis Niloticus (Trewavas, 1983) During a Sludge-Earthworm-Fish Short-Term Cycling”. Italian Journal of Food Safety 8 (1). https://doi.org/10.4081/ijfs.2019.7257.