A. Azuraida and  M. K. Halimah and  C. A. C. Azurahanim and  M. Ishak,  Gamma Irradiation Effect on Structural and Optical Properties of Bismuth-Boro-Tellurite Glasses.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2015, vol. 101(5). 594 - 598
    [viewed 11 December 2019]. Available from: https://publications.waset.org/pdf/10001485.