Kenneth Jae T. Elevado, Joenel G. Galupino, and Ronaldo S. Gallardo. “COMPRESSIVE STRENGTH OPTIMIZATION OF CONCRETE MIXED WITH WASTE CERAMICS AND FLY ASH”. GEOMATE Journal, vol. 16, no. 53, Jan. 2019, pp. 135-40, https://geomatejournal.com/geomate/article/view/2796.