@ARTICLE{Michalczyk_K._Natural_2017,
 author={Michalczyk, K.},
 volume={65},
 number={No 6 (Special Section on Civil Engineering – Ongoing Technical Research. Part II)},
 pages={949-959},
 howpublished={online},
 year={2017},
 title={Natural transverse vibrations of helical springs in sections covered with elastic coatings},
 URL={http://journals.pan.pl/Content/105809/PDF/10.1515bpasts-2017-0102.pdf},
 doi={10.1515/bpasts-2017-0102},
}