@misc{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}, doi={10.1515/bpasts-2017-0102}, }