Benedek, P., J. Ruff, Cs. Nagy, and J. Nyéki. 2000. “Flower Constancy of Honeybees (Apis Mellifera L.) to Blooming Pear Plantations”. International Journal of Horticultural Science 6 (3): 81-85. https://doi.org/10.31421/IJHS/6/3/107.