Birawidha, D. C.; Manaf, A.; Astuti, W.; Daulay, A.; Haryono, T.; Sari, Y.; Suprihatin, S. ECO FRIENDLY CITRIC ACID-ASSISTED SOL-GEL SYNTHESIS OF HIGH-PURITY NANO SILICA FROM DIENG GEOTHERMAL SLAG: CHARACTERIZATION AND OPTIMIZATION METHOD. IPR 2025, 8, 530-539.