@article{Li2013the,
author={Li, V.V.},
title={THE EQUATIONS OF SOWING UNIT PATH AND SPEED WITH VARIABLE MASS IN THE LONGITUDINAL-VERTICAL PLANE},
journal={Bulletin of KSAU},
publisher={Krasnoyarsk State Agrarian University},
year={2013},
pages={156-160},
volume={},
issue={8},
}