TY JOUR TI Results of microscopic research of milling surface of fiber boards of average density (MDF) KW fiber board of average density KW roughness KW milling KW lignin KW microscope JO Actual directions of scientific researches of the XXI century: theory and practice AU Efimova, T.V. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov