Persely, Sz., M. Ladányi, J. Nyéki, Z. Szabó, M. Soltész, and I. Ertsey. 2010. “Comparison of Pear Production Areas from Yield Risk Aspect”. International Journal of Horticultural Science 16 (4): 25-28. https://doi.org/10.31421/IJHS/16/4/911.