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Assessing the Eutrophication of Shengzhong Reservoir Based on Grey Clustering Method[J]. Pan An1, Hu Lihui2, Li Tiesong2, Li Chengzhu2 1. Section of Students’ Affairs, China West Normal University, Nanchong Sichuan 637002, China;2. Land and Resources College, China West Normal University, Nanchong Sichuan 637002, China.Chinese Journal of Population,Resources and Environment. 2009(02)