Zapušek Alenka, Berčič Gorazd, Zavšek Simon, Golob Ludvik, Veber Igor, and Damjan Konovšek. 2024. “UNDERGROUND COAL GASIFICATION (UCG) – THE VELENJE COAL MINE EXPERIENCE”. Journal of Energy Technology 4 (1), 61-76. https://doi.org/10.18690/jet.4.1.61-76.2011.