00625naa#a2200181#i#450# EN\\bibl\7768 20240817191136.6 2222-7962 20151115b2015####ek#y0engy0150####ca RUS RU Determining the size and viability of pollen of local and introduced species of birch trees Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2015 7 с. Journal article local Isakov Igor Mantseva Marina naukaru.ru