@ARTICLE{Droździel_Józef_Method_2010,
 author={Droździel, Józef and Sowiński, Bogdan},
 number={No 2},
 journal={Archives of Transport},
 howpublished={online},
 year={2010},
 publisher={Polish Academy of Sciences Committee of Transport Design},
 title={Method of track vertical stiffness estimation based on experiment},
 URL={http://ochroma.man.poznan.pl/Content/94865/mainfile.pdf},
}