Wiyanti, D. S., and T. D. Laksono. “ANALYSIS OF THE EFFECTS OF SUPERPLASTICIZER ADDITION AND WATER REDUCTION IN CONCRETE MIXTURE ON CONCRETE COMPRESSIVE STRENGTH”. International Journal of Engineering Technologies and Management Research, vol. 7, no. 6, June 2020, pp. 47-57, doi:10.29121/ijetmr.v7.i6.2020.688.