V. C. Moran, J. H. Hoffmann, and H. G. Zimmermann, “100 years of biological control of invasive alien plants in South Africa: History, practice and achievements”, S. Afr. J. Sci., vol. 109, no. 9/10, p. 6, Sep. 2013, doi: 10.1590/sajs.2013/a0022.