Shah, Syed Farman Ali, Aftab, Aziza, Soomro, Noorullah, Nawaz, Mir Shah, AND Vafai, Kambiz. "Waste Water Treatment-Bed of Coal Fly Ash for Dyes and Pigments Industry" Pakistan Journal of Analytical & Environmental Chemistry [Online], Volume 16 Number 2 (1 June 2015)