Spatial Differentiation Pattern and Influence Factor Detection of County-Level Grain Production in Huang-Huai-Hai Region
LIU Yu, REN Yanmin, PAN Yuchun
Acta Scientiarum Naturalium Universitatis Pekinensis . 2020, (2): 315 -323 .  DOI: 10.13209/j.0479-8023.2019.130

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