P Ledent (1986)
Unconventional ways to UCG at great depth. In: Proceedings of the 12th Annual Underground Coal Gasification Symposium,Saarbrücken,August 24-28,1986
Annual Underground Coal Gasification Symposium, vol. 12 p. 118-130.
15240, 150, Ht, SYNAM, H, UCG, PROSENER
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