A. R. Adiatama, R. F. Susanti, W. Astuti, H. T. B. M. Petrus, and K. C. Wanta, “SYNTHESIS AND CHARACTERISTIC OF NANOSILICA FROM GEOTHERMAL SLUDGE: EFFECT OF SURFACTANT”, Metalurgi, vol. 37, no. 2, pp. 73–86, Aug. 2022.