%0 Journal Article %T Determination of kinematic constraints mathematical model of a plane-parallel motion of multi element tractor units %A Antoshchenkov, R.. %K tractor units, movement, model, kinematic constraints %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 3 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov