TY JOUR TI Determining the presence of synthetic ingredients in wood biofuel KW nitrogen KW biofuel KW wood KW mass KW definition KW reactive KW result KW content KW temperature JO Actual directions of scientific researches of the XXI century: theory and practice AU Safonov, A.O. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov