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Held, I. M., Delworth, T. L., Findell, K. L., Knutson, T. R. (2005). Simulation of Sahel drought in the 20th and 21st centuries. PNAS102 (50): 17891–17896. PMID16322101. PMC1312412. DOI: 10.1073/pnas.0509057102.