R. Perdana. Ts, L. . Cundari, S. Safaruddin, and R. Robiansyah, “EFFICIENCY ANALYSIS OF ROTARY KILN EQUIPMENT IN FACTORY II PT. SEMEN BATURAJA (PERSERO) Tbk. REVIEW OF THERMAL EFFICIENCY”, bharasumba, vol. 1, no. 04, pp. 611–618, Oct. 2022.