“Effect of CaO Ratio in Relation to (NH4)H2PO4 and Temperature on Hydroxyapatite from Shells Using The Hydrothermal Method”. G-Tech: Jurnal Teknologi Terapan 10, no. 2 (April 10, 2026): 814–823. Accessed October 1, 2026. https://ejournal.uniramalang.ac.id/g-tech/article/view/9448.