Firdaus, M., Harmaji, A., Febrina, E., Ruth, I., Sunendar, B., & Suryatmojo, I. (2026). Enhancing Properties of Metakaolin-Based Geopolymers: The Effect of Zirconia and Silica Nanosphere Additions. Physics and Chemistry of Solid State, 27(1), 35–43. https://doi.org/10.15330/pcss.27.1.35-43