P. Benedek, Z. Szabó, T. Szabó, and J. Nyéki, “Flower characters and self-fertilization capacity in relation to the bee pollination at sour cherry cultivars”, Int. j. hortic. sci., vol. 12, no. 2, pp. 121–132., Apr. 2006, doi: 10.31421/IJHS/12/2/644.