“Identifikasi Peningkatan Strength Factor Dengan Metode Q-System Pada Terowongan Tambang Bawah Tanah Daerah Perambahan, Kota Sawahlunto, Sumatera Barat: Identification of Strength Factor Improvement Using the Q-System Method in Underground Mining Tunnels in Perambahan Area, Sawahlunto City, West Sumatra”. MINERAL 7, no. 2 (November 15, 2022): 29–36. Accessed April 20, 2026. https://www.journal.ubb.ac.id/index.php/mineral/article/view/3418.