K. S. Hui and K. N. Hui and Seong Kon Lee, A Novel and Green Approach to Produce Nano- Porous Materials Zeolite A and MCM-41 from Coal Fly Ash and their Applications in Environmental Protection. journal = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. May 2009, vol. 29(5). 489 - 499 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/4103.