1. Abdollahi, H. (2011). Pear, botany, cultivars and rootstocks. Ministry of Jihad-e-Agriculture, Tehran, Iran, 200.
2. Anonymous. (2020). Food and Agriculture Organization. STAT Data. www.fao.org.
3. Bhat, Z. A., Dhillon, W. S., Shafi, R. H. S., Rather, J. A., Mir, A. H., Shafi, W., Rashid, R., Bhat, J. A., Rather, T. R., & Wani, T. A. (2012). Influence of storage temperature on viability and in vitro germination capacity of pear (Pyrus spp.) Pollen. Journal of Agricultural Sciences, 4, 128.
4. Bieniasz, M., Necas, T., Dziedzic, E., Ondrasek, I., & Pawłowska, B. K. (2017). Evaluation of pollen quality and self-fertility in selected cultivars of Asian and European Pears. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 45, 375–382.
5. Bots, M. & Mariani, C. (2005). Pollen viability in the field. Research Reports No. CGM 2005-05. University of Nijmegen.