By Nicholson S.E.   in Global and Planetary Change

ISSN:0921-8181|26|1|137-158

Elsevier‎(2000)‎

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By Grist J.   Nicholson S.E.   Mpolokang A.   in Journal of Arid Environments

ISSN:0140-1963|35|2|195-214

Academic Press‎(1997)‎

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