Hutagalung, Errol U., Achmad Basuki, and R. Susworo. “Post-Irradiation Osteosarcoma : A Case Report”. Medical Journal of Indonesia 9, no. 4 (October 1, 2000): 281-3. Accessed January 21, 2022. http://mji.ui.ac.id/journal/index.php/mji/article/view/627.