Siswoyo E, Gunawan . SYNTHESIS AND CHARACTERIZATION HYDROXYAPATITE FROM CALCIUM OXIDE (CAO) CHICKEN EGG SHELL WITH PRECIPITATION METHOD . mijst [Internet]. 2018 Jul. 14 [cited 2024 Apr. 30];4(2):40-5. Available from: https://grdspublishing.org/index.php/matter/article/view/1673