Abraham George E, Royo Carlos M: In situ coal gasification process. Cities Service Oil Company, November 6, 1973: US3770398 (246 worldwide citation)

A method for in situ coal gasification to recover a calorific value gas by the water-gas shift reaction for the optimum formation of carbon monoxide and hydrogen through the simultaneous introduction of carbon dioxide and steam into an injection well in order to shift the reaction kinetics of the pr ...