W. Nobnop, I. Chitapanarux, H. Neamin, S. Wanwilairat, V. Lorvidhaya, and T. Sanghangthum, “Evaluation of Deformable Image Registration (DIR) Methods for Dose Accumulation in Nasopharyngeal Cancer Patients during Radiotherapy”, Radiol Oncol, vol. 51, no. 4, Nov. 2017.