Holb, Imre, and Bart Heijne. 2002. “Comparative Study of Dutch and Hungarian Environmentally-Friendly Apple Orchards on Potential Ascospore Dose of Apple Scab”. Acta Agraria Debreceniensis, no. 1 (May): 31-36. https://doi.org/10.34101/actaagrar/1/3533.