Spatial-Temporal Difference of Grain Yield Per Hectare during 1980?2012 at County Level and Its Balanced Increasing Potential in Henan Province
LIU Yu,GAO Yunbing,GAO Bingbo,REN Yanmin
Acta Scientiarum Naturalium Universitatis Pekinensis . 2014, (6): 1106 -1114 . 

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