Holb, Imre, and Bart Heijne. “Comparative Study of Dutch and Hungarian Environmentally-Friendly Apple Orchards on Potential Ascospore Dose of Apple Scab”. Acta Agraria Debreceniensis, no. 1 (May 12, 2002): 31–36. Accessed May 5, 2024. https://ojs.lib.unideb.hu/actaagrar/article/view/3533.