TY JOUR TI HEATING CAPABILITY OF POSTPYROGEN PINE WOOD KW calorific value KW post-pyrogenic wood KW sound wood KW sapwood KW biofuel JO Forestry Engineering Journal AU Tyukavina, O.N. AU Gudina, A.G. PY 2020 IS 10 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov