基于SPI与相对湿润度指数的1961—2009年东北地区5—9月干旱趋势分析
马建勇，许吟隆，潘婕
Drought tendency based on standardized precipitation index (SPI) and relative moisture index over Northeast China from May to September during 1961-2009
MA Jian-yong，XU Yin-long，PAN Jie
气象与环境学报
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2012, (3): 90
-95
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