Talik Sisin, Noor Nabilah, et al. “Evaluation of Bismuth Oxide Nanoparticles As Radiosensitizer for Megavoltage Radiotherapy”. International Journal on Advanced Science, Engineering and Information Technology, vol. 9, no. 4, Aug. 2019, pp. 1434-43, doi:10.18517/ijaseit.9.4.7218.