TY JOUR TI Method comparative tests for certification of small quantities of wood blanks KW ultrasonic tests KW strength tests KW acoustic performance KW strength KW core KW standard samples JO Actual directions of scientific researches of the XXI century: theory and practice AU Kolesnikova, A.A. AU Fedorova, A.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov