De La Harpe, A. C., and J. H. Visser. “The Determination of the Homogeneity of a Vitis Vinif Era L. Cv. Cape Riesling Vineyard”. South African Journal of Enology and Viticulture, vol. 4, no. 2, May 2017, pp. 77-87, doi:10.21548/4-2-2373.