Snelson, David, Stan Wild, and Martin O’Farrell. “Setting Times of Portland cement–metakaolin–fly Ash Blends”. Journal of Civil Engineering and Management 17, no. 1 (April 13, 2011): 55-62. Accessed January 10, 2025. https://mla.vilniustech.lt/index.php/JCEM/article/view/5105.