@article{esen_2017,  title={A Modified FEM for Transverse and Lateral Vibration Analysis of Thin Beams Under a Mass Moving with a Variable Acceleration},  volume={14},  ISSN={1679-7825},  url={https://doi.org/10.1590/1679-78253180},  DOI={10.1590/1679-78253180},  number={3},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Esen, Ismail},  year={2017},  month={Mar},  pages={485–511} }