@misc{_Contemporary,
 howpublished={online},
 publisher={Wydawnictwo Politechniki Śląskiej},
 language={eng},
 title={Contemporary transportation systems : selected theoretical and practical problems : modelling of change in transportation subsystems},
 type={książka},
 keywords={infrastruktura transportu, systemy transportowe, transport morski, przedsiębiorstwa transportowe, transport drogowy},
}