Syahirah Mohd Zarib, Noratiqah, Shahrulazam Abdullah, and . . “Effect of C6H8O7 Concentration on Silica Extraction of Rice Husk, Rice Husk Ash and Mixture of Rice Husk With Rice Husk Ash Via Acid Leaching Process”. International Journal of Engineering & Technology 7, no. 4.18 (November 27, 2018): 190–195. Accessed May 2, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/21906.