Hou F-h, Z-x Zhang and Q-z Liu (2001). “Application of DEA Method with Preference in Petroleum Enterprises Evaluation.” Industrial Engineering Journal 4(2): 53-57.

Hou F-h, Z-x Zhang and Q-z Liu (2001). “Application of DEA Method with Preference in Petroleum Enterprises Evaluation.” Industrial Engineering Journal 4(2): 53-57.

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