Yeunyongkul, P. ., P. . Kantawong, R. . Munsin, P. . Jarupoom, and P. . Siriprapa. “Effect of Composition on Characteristics of Powder Coating Sludge (PCS)-Metakaolin-Based Geopolymer”. Trends in Sciences, vol. 19, no. 11, May 2022, p. 4501, doi:10.48048/tis.2022.4501.