Krumov, Simeon, et al. “Agrobiological and Economical Potential of New Introduced Table Grapevine Cultivars for Kyustendil Region”. Bulgarian Journal of Crop Science, vol. 53, no. 4, Aug. 2016, pp. 41-48, https://agriacad.eu/ojs/index.php/bjcs/article/view/3216.