A. F. Rafryanto, A. L. Batrisya, D. A. Charlie, and A. Arramel, “Novel Approach to the Synthesis of Silica Gel: Sequential Mechanical Activation and Sol-Gel Methods from Fly Ash Derived from Coal”, J. Res. Nanosci. Nanotech., vol. 13, no. 1, pp. 23–32, Aug. 2024.