Lee, Siew Ling, Jamilah Mohd Ekhsan, and Chui Min Ling. 2022. “Properties and Bifunctional Catalytic Activity of Niobium-Doped Silica-Titania: Effect of Phosphoric Acid Treatment”. Science and Technology Indonesia 7 (4):455-60. https://doi.org/10.26554/sti.2022.7.4.455-460.