Snelson, David, Stan Wild, and Martin O’Farrell. “Setting Times of Portland Cement–metakaolin–fly Ash Blends / Portlandcemenčio, Metakaolino Ir Lakiųjų Pelenų Mišinių Rišimosi Terminai”. Journal of Civil Engineering and Management 17, no. 1 (April 13, 2011): 55-62. Accessed November 20, 2019. https://journals.vgtu.lt/index.php/JCEM/article/view/5105.