South African Journal of Science On-line version ISSN 1996-7489
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DEAN, W.R.J.; BARNARD, P. and ANDERSON, M.D..When to stay, when to go: trade-offs for southern African arid-zone birds in times of drought. S. Afr. j. sci. [online]. 2009, vol.105, n.1-2, pp. 24-28. ISSN 1996-7489.
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