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, Vol. 15, no. 4, Sept. 2009, pp. 33-36., doi:10.31421/IJHS/15/4/837.