Emergy-based assessment for material metabolism and eco-efficiency of human-environmental system in Ningxia Hui Autonomous Region
GUO Xiaojia, CHEN Xingpeng, ZHANG Zilong, LU Chengpeng
Ecology and Environment . 2009, (3): 967 -973 .  DOI: 10.16258/j.cnki.1674-5906(2009)03-0967-07

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