Cheng, Xiaowei, Tao Gu, Sheng Huang, Zaoyuan Li, and Xiaoyang Guo. 2012. “Studies on Mechanism of Activity of Fly Ash-Cement Slurry Improved by High-Energy Ball Milling”. Asian Journal of Chemistry 24 (9):3986-88. https://asianpubs.org/index.php/ajchem/article/view/9518.