TY JOUR TI Determination of flexure arrow a felled tree KW modulus of elasticity KW deflection KW felled trees KW optimization JO Forestry Engineering Journal AU Ushnickiy, A.A. AU Grigor'ev, M.F. PY 2017 IS 6 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov