Analysis of Drought Characteristics of Shaanxi Province in Recent 50 Years Based on Standardized Precipitation Evapotranspiration Index
ZHOU Dan, ZHANG Bo, REN Pei-gui, ZHANG Chun-ling, YANG Shang-wu, JI Ding-min
JOURNAL OF NATURAL RESOURCES . 2014, (4): 677 -688 .  DOI: 10.11849/zrzyxb.2014.04.012