Yetmen Dogan, O., G. Yaprak, F. Demircioglu, E. Algul, B. Ceylaner Bicakci, H. Ozyurt, and N. Isik. “Re-Irradiation Results of Fractionated Stereotactic Radiotherapy (FSRT) With Cyberknife for Locally-Advanced Nasopharengeal Carcinoma (NPC)”. Annals of Medical Research, vol. 27, no. 9, May 2021, pp. 2370-6, http://www.annalsmedres.org/index.php/aomr/article/view/941.