“Analisa XRD Terhadap Perubahan Struktur Dan Kristalinitas Karbonisasi Batubara Sawahlunto – Sijunjung Sumatera Barat: XRD Analysis of Changes in the Structure and Crystallinity of Sawahlunto - Sijunjung West Sumatra Coal Carbonization”. 2019. Talenta Conference Series: Science and Technology (ST) 2 (1): 88-91. https://doi.org/10.32734/st.v2i1.321.