Siddig, N., Ahmed, A., Saad, S. and Koua, F. (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). doi: 10.4081/ijfs.2019.7257.