TY JOUR TI To the question of definition of optimum service life of logging cars and their separate elements KW office properties KW logging cars KW service life JO Actual directions of scientific researches of the XXI century: theory and practice AU Yakovlev, K.. AU Sklyarov, P.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov