Analysis of the change trend and effect factors of reference crop evapotranspiration in recent 50 years in Hexi region
LÜ Xiaodong, WANG Heling, MA Zhongming
Ecology and Environmental Sciences . 2010, (7): 1550 -1555 .  DOI: 10.16258/j.cnki.1674-5906(2010)07-1550-06

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