Duc, Hoang Van. “SYNTHESIS OF MCM–41 MATERIAL USING RICE HUSK ASH AS A SOURCE OF SILICON”. Hue University Journal of Science: Natural Science 126, no. 1C (October 3, 2017): 37-46. Accessed November 15, 2024. http://222.255.146.83/index.php/hujos-ns/article/view/4456.