e121.
Colin J. Campbell and Jean Laherrère, “The End of Cheap Oil”, Scientific American, March 1998; Deffeyes (2001), pp 106–108; Norman J. Hyne (1995), Nontechnical Guide to Petroleum Geology, Exploration, Drilling and Production, pp 444–449. For a detailed survey of enhanced oil recovery see Don W. Green and G. Paul Willhite (1998), Enhanced Oil Recovery.