TY JOUR TI Research of in-service stress-strain state of wooden sleepers KW sleepers KW model KW determination KW stresses KW deformations JO Actual directions of scientific researches of the XXI century: theory and practice AU Bozhelko, I.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov