Hamdani, Ahmad Helman, and Winantris Sanusi. “Pliocene Coal Geochemistry: Palaeovegetation and Palaeoclimate Distribution in Berau Basin, Indonesia”. European Journal of Environment and Earth Sciences 5, no. 3 (June 28, 2024): 42–46. Accessed January 14, 2025. https://ej-geo.org/index.php/ejgeo/article/view/442.