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Nel, Richardson, David Mark (1958-), Rouget, Mathieu, Mgidi, T. N., Mdzeke, N., Le Maitre, David C., Van Wilgen, Brian W., Schonegevel, L., Henderson, Lesley, 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.