Orosz-Kovács, Zs., A. Farkas, T. Bubán, P. Bukovics, E. Nagy Tóth, and H. Déri. “Floral Biological Investigations of Apple Cultivars in Relation to Fire Blight”. International Journal of Horticultural Science 10, no. 2 (May 10, 2004): 9–14. Accessed April 21, 2021. https://ojs.lib.unideb.hu/IJHS/article/view/454.