TY CONF TI ENERGY-RESOURCE-SAVING PLANT FOR WOOD PROCESSING INDUSTRY WASTE PROCESSING WITH THE PURPOSE OF OBTAINING BIOLOGICALLY ACTIVE SUBSTANCE – BETULIN KW betulin KW birch bark KW birch KW biologically active substance KW extraction KW energy-resource-saving installation JO Ecological and resource-saving technologies in science and technology AU Abdullina, D.R. AU Safin, R.G. PY 2022 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov