PURBA, Y. W. .; KARO, P. K.; GINTING, E. Analisis Batubara Jenis Antrasit di PTBA Berdasarkan Kandungan Volatile Matter dan Kalori. Journal of Energy, Material, and Instrumentation Technology, [S. l.], v. 1, n. 1, p. 23–26, 2020. DOI: 10.23960/jemit.v1i1.9. Disponível em: http://jemit.fmipa.unila.ac.id/index.php/jurnal/article/view/9. Acesso em: 21 sep. 2025.