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1. Environmental factors influencing the distribution of Opuntia stricta, an invasive alien plant in the Kruger National Park, South Africa
L.C. Foxcroft, J.H. Hoffmann, J.J. Viljoen, J.J. Kotze
South African Journal of Botany  vol: 73  issue: 1  first page: 109  year: 2007  
doi: 10.1016/j.sajb.2006.09.008