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  1. By: Spies, J J - Saayman, E J L - Voges, S P - Davidse, Gerrit
    Type: Article
    In: Bothalia
    Volume: 19
    Issue: 1
    Date: 1989-10-18
    Page Range: 125--132
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-
  2. By: Voges, S P
    Type: Article
    In: Bothalia
    Volume: 18
    Issue: 1
    Date: 1988-10-23
    Page Range: 114--119
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-