A Study on Sustainable Eggshell-Derived Hydroxyapatite/CMC Membranes: Enhancing Flexibility and Thermal Stability for Sustainable Development Goals (SDGs). Indones. j. sci. technol. 2025;10(2):191-206. Accessed June 7, 2026. https://ijost.upi.edu/index.php/ijost/article/view/449