“ Amorphous Iron Phosphate: Inorganic Sol-Gel Synthesis-Sodium and Potassium Insertion”, Indonesian J. Sci. Technol, vol. 7, no. 2, pp. 187–202, Nov. 2023, Accessed: Sep. 18, 2025. [Online]. Available: https://ejournal.kjpupi.id/index.php/ijost/article/view/47