Ayal, Abdul Wahab R., et al. “Evaluation of Heavy Metal Contamination in Chlorella Vulgaris in the Southern City of Iraq Using Scanning Electron Microscopy and the Risk Assessment: Http: www.doi.org 10.26538 Tjnpr V7i12.6”. Tropical Journal of Natural Product Research (TJNPR), vol. 7, no. 12, Dec. 2023, pp. 5410-4, https://tjnpr.org/index.php/home/article/view/3157.