Study on health assessment and comparison of different tree species in the west-mountainous area, Beijing
MA Zhilin, CHEN Lihua, YU Xianwei, HAN Peng, REN Huijun
Ecology and Environment . 2010, (3): 646 -651 .  DOI: 10.16258/j.cnki.1674-5906(2010)03-646-06

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