Spatial-Temporal Pattern and Causes for Agricultural Labor Productivity in Beijing-Tianjin-Hebei Region
Yu LIU, Yandong ZHENG, Yangfen CHEN
Acta Scientiarum Naturalium Universitatis Pekinensis . 2017, (1): 101 -110 .  DOI: 10.13209/j.0479-8023.2017.001

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