J Patigny and V Chandelle (1977)
Economic prospects of underground gasification at great depth and under high pressure. In: Proceedings of the 3rd Annual Underground Coal Conversion Symposium,Fallen Leaf Lake,California,June 6-9,1977
Underground Coal Conversion Symposium, vol. 3 p. 107-118.
15224, 150, Ht, SYNAM, H, UCG
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