@article{bayat_pakar_bayat_2011,  title={Analytical study on the vibration frequencies of tapered beams},  volume={8},  ISSN={1679-7825},  url={https://doi.org/10.1590/S1679-78252011000200003},  DOI={10.1590/S1679-78252011000200003},  number={2},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Bayat, Mahmoud and Pakar, Iman and Bayat, Mahdi},  year={2011},  month={Jun},  pages={149–162} }