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Augustine. A. Ayantunde, Salvador Fernández-Rivera, Pierre. H. Hiernaux, Herman Van Keulen, Henk M. J. Udo, Day and Night Grazing by Cattle in the Sahel, Journal of Range Management, Vol. 55, No. 2 (Mar., 2002), pp. 144-149
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Ayantunde et al. (2002) studied this question.
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