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Beyerle, Urs; Rueedi, Joerg; Leuenberger, Markus; Aeschbach-Hertig, Werner; Peeters, Frank; Kipfer, Rolf; Dodo, Abdelkader (2003). Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater. Geophysical Research Letters, 30(4) American Geophysical Union 10.1029/2002GL016310
