Rahmad BR. Sedimentasi Batubara dan Karakteristik Mikroskopis Sulfur Batubara Daerah Sangatta, Kalimantan Timur . Prosiding Seminar Nasional ReTII [Internet]. 2020Oct.28 [cited 2024Nov.24];:315-24. Available from: //journal.itny.ac.id/index.php/ReTII/article/view/2038