Daphna Lavee, Uriel N. Safriel, Isaac Meilijson, For How Long Do Trans-Saharan Migrants Stop over at an Oasis?, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 22, No. 1 (Jan. - Mar., 1991), pp. 33-44
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Lavee et al. (1991) studied this question.
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