Study on the Influencing Factors of Grain Production in Hebei Province Based on Gray Correlation Degree Method
WANG Shu-tao,LI Xin-wang,MEN Ming-xin,XU Hao
Scientia Agricultura Sinica . 2011, (1): 176 -184 .  DOI: 10.3864/j.issn.0578-1752.sas-2010-06609

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