Anas, A. S. A., B. Murtala, S. Oktawati, and H. Ilmar. “Epidemiological Aspects of Head and Neck Cancers Based on Radiotherapy Registry in Hospital of Hasanuddin University South of Sulawesi Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 27, no. 1, May 2016, pp. 74-79, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5716.