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Contribution of additives Cu to its accumulation in pig feces: study in Beijing and Fuxin of China[J]. LI Yan-xia, LI Wei, WU Juan, XU Li-chao, SU Qiu-hong, XIONG Xiong Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. College of Food Science and Engineering, Shandong Agricultural University, Taian 271018, China College of Resources and Environment, Southwest University, Chongqing 400716, Chi