1. Sedysheva GA (2010) Some results of a comparative study of the features of generative structures in apple forms of different levels of ploidy. Mod Garden Genet Select Varietal Stud 2:3–6
2. Vizzotto G, Driussi E, Pontoni M, Testolin R (2018) Effect of flower pollination on fruit set and cropping in apple. Am J Agric Forestry 6(5):156–161. https://doi.org/10.11648/j.ajaf.20180605.16
3. Bukarchuk VF (2001) The introduction of apple varieties into production and the principles of their placement in plantations. Zh Sadovod, Vinodar and Winemaking of Moldova 3:12–15
4. Stosser R (1997) Bedeutung der fremdbefruchtung im obstbau. Erwerbsobstbau 39(5):127–129
5. Funke W (2009) Komplizierte Befruchtungsverhaltnisse. Eipeldauers Gartenmag 61(4):38–39