TY JOUR TI THE NATURAL POTENTIAL OF REGENERATION IN FIR FORESTS, DAMAGED DURING THE INVASION OF POLYGRAPHUS PROXIMUS KW natural regeneration KW infestations of xylophagous KW Abies sibirica Ledeb. KW degradation of forests KW Polygraphus proximus Blandf. JO Forestry Engineering Journal AU Debkov, N.M. PY 2017 IS 7 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov