Djayasinga, R. .; Sumardi, S. .; Simanjuntak, W. .; Hadi, S. .; Sugiarti, M. .; Mangapul Situmeang, R. T. . SYNTHESIS OF CALCIUM OXIDE UTILIZING CHICKEN EGGSHELL WASTE VIA A FOAM-FREE APPROACH. SEHATI 2024, 10, 1-7.