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Keeling RF, Graven HD, Welp LR, Resplandy L., Bi J., Piper S.C, Sun Y., Bollenbacher A., Meijer H.AJ.  2017.  Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis. Proceedings of the National Academy of Sciences of the United States of America. 114:10361-10366.
Li J.B, Xie SP, Cook E.R.  2014.  El Nino phases embedded in Asian and North American drought reconstructions. Quaternary Science Reviews. 85:20-34.
Li J.B, Xie SP, Cook E.R, Morales M.S, Christie D.A, Johnson N.C, Chen F.H, D'Arrigo R., Fowler A.M, Gou X.H et al..  2013.  El Nino modulations over the past seven centuries. Nature Climate Change. 3:822-826.