“Sudi Pendahuluan Pengaruh Karakteristik Batubara Peringkat Rendah Cekungan Kutai Terhadap Gasifikasi Batubara: Preliminary Study Effect of Characteristic Low Rank Coal Kutai Basin Against Coal Gasification”. PROMINE 4, no. 2 (August 15, 2018). Accessed May 1, 2026. https://journal.ubb.ac.id/index.php/promine/article/view/105.