Geopolitical risk and ecological efficiency: A combination approach based on super-efficiency-DEA and

Qiang Wang1, Chen Zhang2, Rongrong Li2

  • 1School of Economics and Management, Xinjiang University, Wulumuqi, 830046, People's Republic of China; School of Economics and Management, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China.

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