Laphrom, T., P. Janpa, and P. Rungrojchaipon. “Catalytic Study of KMnO4-Zeolite 13X Catalyst for the Synthesis of Glycerol Carbonate from Carbonylation of Glycerol and Urea”. Journal of Science Ladkrabang, vol. 30, no. 1, Apr. 2021, pp. 69-80, https://li01.tci-thaijo.org/index.php/science_kmitl/article/view/245624.