1. Akiho, H., Yamamoto, T., Tochihara, Y., Noda, N., Noguchi, S., & Ito, S. (2012). Speciation and oxidation reaction analysis of selenium in aqueous solution using X-ray absorption spectroscopy for management of trace element in FGD liquor. Fuel, 102, 156–161.
2. Bajaj, M., Eiche, E., Neumann, T., Winter, J., & Gallert, C. (2011). Hazardous concentrations of selenium in soil and groundwater in north-West India. Journal of Hazardous Materials, 189(3), 640–646.
3. Blissett, R. S., & Rowson, N. A. (2012). Review article A review of the multi-component utilisation of coal fly ash. Fuel, 97, 1–23.
4. Canafoglia, M. E., Lick, I. D., Ponzi, E. N., & Botto, I. L. (2009). Natural materials modified with transition metals of the cobalt group: feasibility in catalysis. The Journal of the Argentine Chemical Society, 97, 58–68.
5. Chansiriwat, W., Tanangteerapong, D., & Wantala, K. (2016). Synthesis of zeolite from coal fly ash by hydrothermal method without adding alumina and silica sources: effect of aging temperature and time. Sains Malaysiana, 45(11), 1723–1731.