Shah, Syed Farman Ali, Aziza Aftab, Noorullah Soomro, Mir Shah Nawaz, & Kambiz Vafai. "Waste Water Treatment-Bed of Coal Fly Ash for Dyes and Pigments Industry." Pakistan Journal of Analytical & Environmental Chemistry [Online], 16.2 (2015): 9. Web. 10 Aug. 2022