Mary Ann Adajar, Joenel Galupino, Cielo Frianeza, Jilliane Faye Aguilon, Jan Brayden Sy, and Paul Adrian Tan. “COMPRESSIVE STRENGTH AND DURABILITY OF CONCRETE WITH COCONUT SHELL ASH AS CEMENT REPLACEMENT”. GEOMATE Journal, vol. 18, no. 70, June 2020, pp. 183-90, https://geomatejournal.com/geomate/article/view/637.