Li X-M, F-H Hou, Z-X Zhang and J-F Sun (2004). “Evaluation of Economic Benefit of Petroleum Enterprises in DEA.” J Southwestern Petroleum Institute 26(6): 86.

Li X-M, F-H Hou, Z-X Zhang and J-F Sun (2004). “Evaluation of Economic Benefit of Petroleum Enterprises in DEA.” J Southwestern Petroleum Institute 26(6): 86.

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