Davarynejad, G. H., J. Nyéki, J. Tornyai, Z. Szabó, and M. Soltész. “Terminology of Fruit Set and Fruit Drop of Sour Cherry Cultivars”. International Journal of Horticultural Science 15, no. 4 (September 2, 2009): 33-36. Accessed April 6, 2020. https://ojs.lib.unideb.hu/IJHS/article/view/837.