Tree-ring recorded of the drought variability in the northwest monsoon marginal, China
ZHANG Fen, CHEN Qiaomei, SU Jiajia, DENG Yang, GAO Linlin, GOU Xiaohua
JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY . 2017, (2): 245 -251 .  DOI: 10.7522/j.issn.1000-0240.2017.0028