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李树岩, 刘荣花, 师丽魁, 马志红
Analysis on DroughtCharacteristic ofHe’nan in Resent 40 Year  Based onM eteorologicalDroughtComposite Index
LI Shu-Yan, LIU Rong-Hua, SHI Li-Kuai, MA Zhi-Gong
J4 . 2009, (2): 97 -102 .