TY JOUR TI Preparation of pine seeds by liquid separation KW tree seeds KW mechanical damage KW liquid separation KW efficiency of reforestation JO Actual directions of scientific researches of the XXI century: theory and practice AU Gradyskiy, Y.. AU Temnikov, D.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov