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FENG Chao-Yang, 北京林业大学林学院, 北京 100083, College of Forestry, Beijing Forestry University, Beijing 100083, China, WANG He-Song, SUN Osbert Jianxin. "Temporal changes of vegetation water use efficiency and its influencing factors in Northern China." Chinese Journal of Plant Ecology 42.4 (2018) 453-465