Rahmi, H., D. Susetyo, and R. Juniah. “Utilization Study of Void Mine For Sustainable Environment of The Limestone Mining Sector at PT Semen Baturaja (Persero) Tbk”. Indonesian Journal of Environmental Management and Sustainability, vol. 3, no. 2, June 2019, pp. 54-59, doi:10.26554/ijems.2019.3.2.54-59.