Spatial and Temporal Variation Characteristics of Drought in Northwest China During 1961-2009 with Standardized Precipitation Index
REN Yu-long, SHI Yan-jun, WANG Jin-song, LI Yi-ping, ZHU Yong-jun, YANG Zi-he, WEI Bo-long
JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY . 2013, (4): 938 -948 .  DOI: 10.7522/j.issn.1000-0240.2013.0106

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