Karakteristik Batubara Peringkat Rendah Formasi Bobong dan Implikasinya Terhadap Coal Liquefaction . Geomine [Internet]. 2020 Apr. 30 [cited 2025 Jun. 28];8(01):17-24. Available from: https://jurnal.fti.umi.ac.id/index.php/JG/article/view/1387