Ali, I., and M. M. Ali. “Short Communication Some Studies on the Changes in the Composition of Coal Ash and Bottom/Fly Ash Produced in Atmospheric Fluidized Bed Combustor”. Biological Sciences - PJSIR, vol. 49, no. 5, Oct. 2006, pp. 341-3, https://v2.pjsir.org/index.php/biological-sciences/article/view/1244.