Manalu, J., Tjhay, , F. and Theodora Kristoforus 2020. Effect of Calcination Time on Bovine-Derived Hydroxyapatite as Bone Implant Material: An <em>In Vitro </em>Study. Asian Journal of Applied Sciences. 8, 5 (Oct. 2020). DOI:https://doi.org/10.24203/ajas.v8i5.6363.