Saleh, S. M. K., S. M. Nasr, and M. A. Okbah. “Geochemical Rorms and Risk Assessment of Some Heavy Metals in Aden Coasts Sediments, Yemen”. University of Aden Journal of Natural and Applied Sciences, vol. 23, no. 2, Oct. 2019, pp. 383-97, doi:10.47372/uajnas.2019.n2.a10.