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2) Sun Junyan, Liu Yu, 2013, Drought variations in the middle Qilian Mountains, northeast Tibetan Plateau, over the last 450 years as reconstructed from tree rings, Dendrochronologia, doi: 10.1016/j.dendro.2012.07.004
3) Sun Junyan, Liu Yu, Sun Bo, Wang Ruiyuan, 2012, Tree-ring based PDSI reconstruction since 1853 AD in the source of the Fenhe River Basin, Shanxi Province, China, Science in China - Series D: Earth Sciences, 55(11), 1847-1854
4) Sun Junyan, Liu Yu, 2012, Tree ring based precipitation reconstruction in the south slope of the middle Qilian Mountains, northeastern Tibetan Plateau, over the last millennium, Journal of Geophysical Research, 117(D08108), 1-11
5) Liu Yu, Sun Junyan, Song Huiming, Cai Qiufang, Bao Guang, Li Xuxiang, 2010, Tree-ring hydrologic reconstructions for the Heihe River watershed, western China since AD 1430, Water Research, 44(9), 2781-2792
6) Liu Yu, Sun Junyan, Yang Yinke, Cai Qiufang, Song Huiming, Shi Jiangfeng, An Zhisheng, Li Xuxiang, 2007, Tree-ring-derived precipitation records from Inner Mongolia, China, since A.D. 1627, Tree-ring Research, 63(1): 3-14