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Nel, Richardson, D.M., Rouget, M., Mgidi, T.N., Mdzeke, N., Le Maitre, D.C., Van Wilgen, B.W., Schonegevel, L., Henderson, L., Neser, S., 2004 - A proposed classification of invasive alien plant species in South Africa : towards prioritizing species and areas for management action ; South African Journal of Science, 100 : 53-64.