TY JOUR TI Multi-criteria optimization of skidding process on optional fellings KW skidding KW the primary transport KW logging works KW the generalized criterion of efficiency KW multi criteria optimization of the process JO Forestry Engineering Journal AU FilichkinaM, M.. AU Abramov, V.V. PY 2013 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov