Gonda, I., L. Lakatos, N. Rakonczás, and I. J. Holb. “The Effect of Summer Pruning on Solar Radiation Conditions in Apple Orchards”. International Journal of Horticultural Science 12, no. 4 (September 26, 2006): 87–91. Accessed February 28, 2021. https://ojs.lib.unideb.hu/IJHS/article/view/685.