@misc{Grulkowski_Sławomir_Drogi,
 author={Grulkowski, Sławomir and Kęda, Zbigniew and Koc, Władysław and Nowakowski, Mirosław J.},
 howpublished={online},
 publisher={Gdańsk University of Technology},
 language={pol},
 type={digital document},
 title={Drogi szynowe},
 keywords={rails, railways, projects and plans},
}