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- [5] Trace elements in tree rings and their environmental effects: A case study in Xi’an City[J]. LIU Yu1,3, TA WeiYuan1, BAO TingYi2, YANG ZengYue2, SONG HuiMing3, LIU Na1, WANG WeiPing1, ZHANG HongYi2, ZHANG Wei2 & AN ZhiSheng3 1 School of Human Settlement and Civil Engineering, Xi’an JiaoTong University, Xi’an 710049, China;2 The Institute of Environment and Reproduction, Department of Urology, The Fourth Military Medical University, Xi’an 710038, China;3 Institute of Earth Environment, Chinese Ac