Hunter, J., H. Ruffner, and C. Volschenk. “Starch Concentrations in Grapevine Leaves, Berries and Roots and the Effect of Canopy Management”. South African Journal of Enology and Viticulture, vol. 16, no. 2, May 2017, pp. 35-40, doi:10.21548/16-2-2270.