Phoo-ngernkham, Tanakorn, Prinya Chindaprasirt, Vanchai Sata, and Sakonwan Hanjitsuwan. 2014. “Influence of Portland Cement Replacement in High Calcium Fly Ash Geopolymer Paste”. Engineering and Applied Science Research 41 (1):19-27. https://ph01.tci-thaijo.org/index.php/easr/article/view/21758.