@misc{Sochacki_Wojciech_Vibration,
 author={Sochacki Wojciech and Bolt, Marta},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 type={czasopismo},
 title={Vibration of crane radius change system with internal damping},
 keywords={truck crane, vibration damping, eigenvalues},
}