@article{sedighi_shirazi_zare_2012,  title={Novel equivalent function for deadzone nonlinearity: applied to analytical solution of beam vibration using He's Parameter Expanding Method},  volume={9},  ISSN={1679-7825},  url={https://doi.org/10.1590/S1679-78252012000400002},  DOI={10.1590/S1679-78252012000400002},  number={4},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Sedighi, Hamid M. and Shirazi, Kourosh H. and Zare, Jamal},  year={2012},  month={Aug},  pages={443–452} }