R. Martiana, S. A. Liza, C. Wani, S. Hilmayati, A. P. Astuti, and J. ’Ardhuha, “The Effect of Adding Ketapang Fruit Ash on the Physical and Mechanical Properties of Geopolymer Concrete Based on High-Calcium Fly Ash Type C with Alkali Activator”, J. Pendidik. Fis. Teknol., vol. 10, no. 2, pp. 545–550, Dec. 2024.