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