Habib, Farzana, et al. “Development and Characterization of Porous Hydroxyapatite Scaffold by Using Polymeric Sponge Method”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 38, no. 2, Apr. 2018, pp. 1-7, https://gssrr.org/JournalOfBasicAndApplied/article/view/8230.