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Tourism ecological security early warning of Zhangjiajie, China based on the improved TOPSIS method and the grey GM (1,1)model
XU Mei, LIU Chun-la, LI Dan, ZHONG Xiao-lin
Chinese Journal of Applied Ecology . 2017, (11): 3731 -3739 .  DOI: 10.13287/j.1001-9332.201711.017