Simatupang, Partogi H., Iswandi Imran, Ivindra Pane, and Bambang Sunendar. 2015. “On the Development of a Nomogram for Alkali Activated Fly Ash Material (AAFAM) Mixtures”. Journal of Engineering and Technological Sciences 47 (3):231-49. https://doi.org/10.5614/j.eng.technol.sci.2015.47.3.1.