Gamal, G. A., F. A. Al-Mufadi, and A. H. Said. “Effect of Iron Additives on the Microstructure of Hydroxyapatite”. Engineering, Technology & Applied Science Research 3, no. 6 (December 18, 2013): 532–539. Accessed January 22, 2022. https://www.etasr.com/index.php/ETASR/article/view/369.