Saayman, D. “Investigations into the Causes and Control of Theu Growth Arrestment Phenomenon of Sultana. I. Symptoms and Survey Results”. South African Journal of Enology and Viticulture 4, no. 1 (May 11, 2017): 21–26. Accessed February 20, 2026. https://www.journals.ac.za/sajev/article/view/2377.