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- [8] Research on Methods of Ecological Security Assessment of the Middle and Lower Reaches of Liaohe River Based on GIS[J]. Wang Geng 1,2 , Nie Baochi 3, Wang Lin 1 & Wu Wei 1 1. School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China;2. Urban and Environmental School, Liaoning Normal University, Dalian 116029, China;3. Shenyang Buraue of Water Resources, Shenyang 110013, China..Chinese Journal of Population,Resources and Environment. 2005(