Abdulkareem, H. N., and A. I. Alwared. “Performance of Immobilized Chlorella Algae for Removing Pb(II) Ions from Aqueous Solution”. Iraqi Journal of Chemical and Petroleum Engineering, Vol. 20, no. 3, Sept. 2019, pp. 1-6, doi:10.31699/IJCPE.2019.3.1.