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Analysis of the Threatening Factors on Wintering Otis tarda in the Yellow River Wetland of Shaanxi Province
WU Yiqun, SHEN Jie, LIU Jianwen, LIU Fangqing, WANG Shuai, XÜ Xiu
Forest and Grassland Resources Research . 2013, (5): 91 -94 .