@article{Sakalo2015penetration,
author={Sakalo, V.. and Sakalo, A..},
title={Penetration factor of the surfaces in fast algorithm of solution of contact problems for wheel and rail.},
journal={Bulletin of Bryansk state technical university},
publisher={Bryansk State Technical University},
year={2015},
pages={46-51},
volume={2015},
issue={1},
}