TY JOUR TI Determination of the yield of lumber produced of logs, with several quality areas KW wood KW timber KW quality area KW lumber. JO Actual directions of scientific researches of the XXI century: theory and practice AU Kholkina, N.. AU Razumov, E.. AU Pekmenov, V.. AU Mikryukova, E.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov