Edahwati, L. ., Sutiyono, R. N. . Hutagalung, and S. R. Z. . Nukhuf. “Synthesis of Calcium Phosphate from Boiler Egg Shells As Raw Material for Hydroxyapatite”. Nusantara Science and Technology Proceedings, Nov. 2022, pp. 108-13, doi:10.11594/nstp.2022.2718.