基于标准化降水指数与Z指数的洮河流域干旱趋势分析
王帅兵,李常斌,杨林山,杨文瑾,樊小鹏
Drought Trend Analysis Based on Standardized Precipitation Index and the Z  index in the Tao River Basin
干旱区研究 . 2015, (3): 565 -572 .