00804naa#a2200181#i#450# EN\\bibl\111114 20260226070957.4 2222-7962 20251226b2025####ek#y0engy0150####ca RU Mathematical model for determining the volume of birch bark at woodworking enterprises when organizing the production of composite materials Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2025 18 с. Journal article local Сельское хозяйство. Лесное хозяйство. Охота. Рыбное хозяйство. 63 Chernykh Aleksandr Sergeevich Rublev I. Yu. zh-szf.ru