TY CONF TI UMFASSENDE VERARBEITUNG VON BIRKENRINDE KW betulin KW birch bark processing KW extraction JO TECHNOLOGIES IN BIOECONOMICS: INNOVATIONS AND CHALLENGES IN THE 21ST CENTURY AU Fakhrutdinova, L.R. AU Safin, R.G. AU Ziatdinova, D.F. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov