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2. Massaquoi J.G.M. and Riggs J.B. “Heat and Mass Transfer in a Burning Coal Seam” Proc. of the 7th UCC symposium. Fallen Leaf Lake, Sept (1981).
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4. “Underground Coal Gasification”;Gregg;AICHE J.,1978
5. Schwartz, S.II. “A preliminary model for predicting water intrusion into a cavity formed during UCG process”. Proc. of 5th UCC Symposium, Alexandria, V pg. 341 (1979)