TY JOUR TI Heavy metal pollution of ecosystem components in the area of copper-nickel sulfide ore occurrences "Elanskoe" and "Elkinskoe" of Novokhopersk district, Voronezh region KW heavy metals KW biological monitoring KW pollution of ecosystems components JO Forestry Engineering Journal AU Kharchenko, N.N. AU Yaitskikh, M.. PY 2014 IS 4 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov