Basra, S., Z. Iqbal, K. ur-Rehman, H. Ur-Rehman, and M. Ejaz. “Time Course Changes in PH, Electrical Conductivity and Heavy Metals (Pb, Cr) of Wastewater Using Moringa Oleifera Lam. Seed and Alum, a Comparative Evaluation”. Journal of Applied Research and Technology, Vol. 12, no. 3, June 2014, doi:10.1016/S1665-6423(14)71635-9.