N. Yodtongde, V. Boonkitticharoen, M. Dhanachai, and P. Puataweepong, “Comparison of Second Cancer Risk in Patients with Liver Cancer Treated By Stereo-tactic Body Radiotherapy and Three-Dimensional Conformal Radiotherapy”, Rama Med J, vol. 35, no. 3, pp. 202–210, Sep. 2012.