TY JOUR TI MatematicheskoŠµ software for accounting timber KW accounting timber KW mathematical model KW tree trunks KW sticks KW logs KW forest Fund KW wood cutting KW timber industry JO Actual directions of scientific researches of the XXI century: theory and practice AU Petrovskiy, V.. AU Baturin, K.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov