Racskó, József, Sándor Thurzó, and Gábor Drén. 2005. “Effect of M9, MM106 and Seedling Rootstocks on Sunburn-Sensitivity of 33 Apple Cultivars, and Sunburn Effects on Fruit Quality”. Acta Agraria Debreceniensis, no. 16 (December): 236-47. https://doi.org/10.34101/actaagrar/16/3316.