Zapušek, A.; Berčič, G.; Zavšek, S.; Golob , L.; Veber , I.; Konovšek, D. UNDERGROUND COAL GASIFICATION (UCG) – THE VELENJE COAL MINE EXPERIENCE. JET 2024, 4 (1), 61-76. https://doi.org/10.18690/jet.4.1.61-76.2011.