TOMAŽIČ, Irma, and Zora KOROŠEC-KORUZA. “Grapevine Variety Identification by Means of Ampelographic and Phyllometric Descriptors”. Acta Agriculturae Slovenica, vol. 71, no. 1, Sept. 1998, pp. 173–177, https://doi.org/10.14720/aas.1998.71.1.16048.