TY JOUR TI Study of methods to reduce the influence of surface tension force during flotation of coniferous seeds KW pine KW spruce KW larch KW seed flotation KW surface tension KW rotator KW surfactant JO Forestry Engineering Journal AU Lavrenov, M.A. AU Kotov, A.. PY 2026 IS 16 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov