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  1. By: Russell, G E Gibbs - Welman, W G - Germishuizen, G - Retief, E - Pienaar, B J - Reid, Christopher S. - Fisch, L - Van Rooy, J - Van Wyk, C M - Kalake, E
    Type: Article
    In: Bothalia
    Volume: 18
    Issue: 2
    Date: 1988-10-23
    Page Range: 293--304
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-