Holb, I. and Heijne, B. 2002. Comparative Study of Dutch and Hungarian Environmentally-friendly Apple Orchards on Potential Ascospore Dose of Apple Scab. Acta Agraria Debreceniensis. 1 (May 2002), 31–36. DOI:https://doi.org/10.34101/actaagrar/1/3533.