P. Torkittikul, T. Kaosomboon, W. Makararotrit, S. Malai, and A. . Sripuman, “THE PRELIMINARY INVESTIGATION OF USING WASTE PLASTER GYPSUM MOLD AS SAND REPLACEMENT MATERIAL IN MORTAR”, PSRU J. Sci. Tech., vol. 7, no. 2, pp. 1–13, Aug. 2022.