Tambunan OR, Mohadi R. Preparation of polyoxometalate compound (NH4)6(β-P2W18O62)/SiO2 by sol-gel method and its characterization. sci. technol. indones. [Internet]. 2017 Jun. 21 [cited 2026 Apr. 15];2(1):1-8. Available from: https://sciencetechindonesia.com/index.php/jsti/article/view/8