kasmira, kasmira. “Analisis Rank Batu Bara Dan Potensi Gas Methane Pada Lapangan X Formasi Balikpapan”. BANDAR: JOURNAL OF CIVIL ENGINEERING 3, no. 1 (April 21, 2021): 18–23. Accessed June 3, 2026. https://ojs.unsulbar.ac.id/index.php/bjce/article/view/851.