Raghad Hamid Hilal (2020) “(Polyacrylamide-Kaolin) Composite Used For Extraction Precious Metals (Au+1, Ag+1) From Electronic Waste Solution by Using Hydrometallurgical Method”, Wasit Journal of Engineering Sciences, 7(3), pp. 41–49. doi:10.31185/ejuow.Vol7.Iss3.136.