Examining the Cost Efficiency of Chinese Hydroelectric Companies Using a Finite Mixture Model 8.06
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Energy Economics, vol. 36, 2013, p. 511-517.

Performance Assessment of Portuguese Wind Farms: Ownership and Managerial Efficiency 12.84
Carlos Pestana Barros, Olinda Sequeira Antunes
Energy Policy, vol. 39, 2011, p. 3055-3063.