Udovychenko, K., Ya. Ivanovych, and N. Triapitsyna. “Association of Allele Variants of Gene Rf With Red Fruit Color of Apple Cultivars of Ukrainian Breeding”. Agricultural Science and Practice 3, no. 3 (December 15, 2016): 54-59. Accessed October 25, 2021. https://agrisp.com/index.php/agrisp/article/view/91.