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Joubert D, Zimmermann I, Fendler J, Winschiers-Theophilus H, Graz FP, Smit N, Hoffman MT 2014. The development of an expert system for arid rangeland management in central Namibia with emphasis on bush thickening. African Journal of Range and Forage Science 31 (2) 161-172
Zimmermann I, Miller ES, Smit GN 2009. A problem tree to identify causes of roundworm infestation in sheep. Agricola 19 7 - 15
Zimmermann I, Joubert DF, Smit GN 2008. A Problem Tree to diagnose Problem Bush. Agricola 18 27 - 33
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A Problem Tree to diagnose Problem Bush.pdf 561.45 KB
Winschiers-Theophilus H, Fendler J, Stanley C, Joubert DF, Zimmermann I, Mukumbira S 2008. A bush encroachment decision support system's metamorphosis.

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