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Irzaman, I and Cahyani, Indah Dwi and Aminullah, A and Maddu, Akhirudin and Yuliarto, Brian and Siregar, Ulfah Biosilica Properties from Rice Husk using Various HCl Concentrations and Frequency Sources" Egyptian Journal of Chemistry. Egyptian Journal of Chemistry.
Irzaman, I and Yustaeni, Diah and Aminullah, A and Irmansyah, I and Yuliarto, Brian Purity, Morphological, and Electrical Characterization of Silicon Dioxide from Cogon Grass (Imperata cylindrica) Using Different Ashing Temperatures. Egyptian Journal of Chemistry. ISSN 2357-0245