By Stapelberg FH   van Rooyen MW   Bothma J du P   in African Journal of Range and Forage Science

ISSN:1727-9380|25|3|111-119

Taylor & Francis Ltd‎(2008)‎

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By van Essen L.D.   Bothma J.duP.   van Rooyen N.   Trollope W.S.W   in African Journal of Range and Forage Science

ISSN:1727-9380|17|1-3|115-118

Taylor & Francis Ltd‎(2000)‎

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By Tarr J. A.   Gaugris J. Y.   van Rooyen M. W.   Bothma J. du P.   in The International Journal of Sustainable Development and World Ecology

ISSN:1350-4509|13|5|435-443

Taylor & Francis Ltd‎(2006)‎

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