Radvánszky, A., E. Mihalik, L. Dorgai, and T. Bubán. “Some Structural Characteristics of the Flowers of Apple Cultivars With Different Susceptibilty to Fire Blight”. International Journal of Horticultural Science, Vol. 10, no. 2, May 2004, pp. 21-23., doi:10.31421/IJHS/10/2/456.