“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, vol. 4, no. 2, Aug. 2018, doi: 10.33019/promine.v4i2.105.