Z. Veres, I. J. Holb, J. Nyéki, Z. Szabó, and M. G. Fári, “Total anthocyanine content and antioxidant density of some Hungarian sour cherry varieties”, Int. j. hortic. sci., vol. 11, no. 2, pp. 109–111., May 2005, doi: 10.31421/IJHS/11/2/589.