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Liu, Xiaohong, Li, Aijun, Qu, Jingjing and Xie, Chunping (2022) Measuring environmental efficiency and technology inequality of China’s power sector: methodological comparisons among data envelopment analysis, free disposable hull, and super free disposable hull models. Environmental Science and Pollution Research, 29 (32). 48607 - 48619. ISSN 0944-1344