De La Harpea, A. C., and J. H. Visser. “Growth Characteristics of Vitis Vinifera L. Cv. Cape Riesling”. South African Journal of Enology and Viticulture 6, no. 1 (May 10, 2017): 1–6. Accessed February 28, 2026. https://www.journals.ac.za/sajev/article/view/2352.