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Yilma Seleshi, G. R. Demaree, Rainfall Variability in the Ethiopian and Eritrean Highlands and its Links with the Southern Oscillation Index, Journal of Biogeography, Vol. 22, No. 4/5, Terrestrial Ecosystem Interactions with Global Change, Volume 2 (Jul. - Sep., 1995), pp. 945-952
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Seleshi et al. (1995) studied this question.
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