Thompson RG, PS Dharmapala, LJ Rothenberg and RM Thrall (1996). ?DEA/AR Efficiency and Profitability of 14 Major Oil Companies in U.S. Exploration and Production.” Computer and Operations Research 23(4): 357-373.

Thompson RG, PS Dharmapala, LJ Rothenberg and RM Thrall (1996). ?DEA/AR Efficiency and Profitability of 14 Major Oil Companies in U.S. Exploration and Production.” Computer and Operations Research 23(4): 357-373.

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